Post a /export. Easier to help that way.

# mar/05/2018 20:51:35 by RouterOS 6.41.2
# software id = LQ3F-HNQ5
#
# model = RouterBOARD 952Ui-5ac2nD
# serial number = 71B2069FA9E7
/interface bridge
add fast-forward=no mtu=1500 name=HyppTV
add admin-mac=6C:3B:6B:51:76:CB auto-mac=no comment=defconf fast-forward=no \
    name=bridge
/interface ethernet
set [ find default-name=ether1 ] comment=WAN
set [ find default-name=ether2 ] name=ether2-master
set [ find default-name=ether5 ] comment=IPTV poe-out=off
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-onlyn comment=2.4GHz country=malaysia \
    disabled=no distance=indoors frequency=2437 frequency-mode=\
    regulatory-domain mode=ap-bridge ssid=[snip] wireless-protocol=802.11 \
    wmm-support=enabled wps-mode=disabled
set [ find default-name=wlan2 ] band=5ghz-a/n/ac channel-width=20/40/80mhz-Ceee \
    comment=5GHz country=malaysia disabled=no distance=indoors frequency=auto \
    frequency-mode=regulatory-domain mode=ap-bridge ssid=[snip] \
    wireless-protocol=802.11 wmm-support=enabled wps-mode=disabled
/interface wireless nstreme
set wlan1 comment=2.4GHz
set wlan2 comment=5GHz
/interface wireless manual-tx-power-table
set wlan1 comment=2.4GHz
set wlan2 comment=5GHz
/interface vlan
add interface=ether1 name=vlan500 vlan-id=500
add interface=ether1 name=vlan600 vlan-id=600
/interface pppoe-client
add add-default-route=yes default-route-distance=0 disabled=no interface=\
    vlan500 keepalive-timeout=60 name="TM Unifi" password=[snip] user=\
    [snip]
/interface list
add exclude=dynamic name=discover
add name=mac-winbox
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" mode=\
    dynamic-keys supplicant-identity=MikroTik wpa-pre-shared-key=\
    "[snip]" \
    wpa2-pre-shared-key=\
    "[snip]"
add authentication-types=wpa2-psk eap-methods="" mode=dynamic-keys name=guest \
    supplicant-identity=MikroTik wpa-pre-shared-key=[snip] \
    wpa2-pre-shared-key=[snip]
/interface wireless
add disabled=no mac-address=6E:3B:6B:51:76:CF master-interface=wlan2 name=wlan3 \
    security-profile=guest ssid=[snip] wps-mode=disabled
add disabled=no mac-address=6E:3B:6B:51:76:D0 master-interface=wlan1 name=wlan4 \
    security-profile=guest ssid=[snip] wps-mode=disabled
/ip hotspot profile
set [ find default=yes ] html-directory=flash/hotspot
/ip pool
add name=PoolIPv4 ranges=192.168.1.100-192.168.1.129
/ip dhcp-server
add address-pool=PoolIPv4 disabled=no interface=bridge lease-time=2h name=\
    DHCPIPv4
/ipv6 pool
add name=PoolIPv6 prefix=2001::/64 prefix-length=64
/snmp community
set [ find default=yes ] addresses=0.0.0.0/0
/interface bridge filter
add action=drop chain=forward in-interface=wlan3
add action=drop chain=forward out-interface=wlan3
add action=drop chain=forward in-interface=wlan4
add action=drop chain=forward out-interface=wlan4
/interface bridge port
add bridge=bridge comment=defconf interface=ether2-master
add bridge=bridge comment=defconf hw=no interface=wlan1
add bridge=bridge comment=defconf hw=no interface=wlan2
add bridge=bridge hw=no interface=wlan3
add bridge=bridge hw=no interface=wlan4
add bridge=HyppTV hw=no interface=ether5
add bridge=HyppTV hw=no interface=vlan600
add bridge=bridge interface=ether3
add bridge=bridge interface=ether4
/ip neighbor discovery-settings
set discover-interface-list=discover
/ipv6 settings
set accept-router-advertisements=yes
/interface list member
add interface=ether2-master list=mac-winbox
add interface=wlan2 list=mac-winbox
add interface=wlan1 list=mac-winbox
add interface=wlan3 list=mac-winbox
add interface=wlan4 list=mac-winbox
/interface wireless access-list
add signal-range=-90..120
add authentication=no forwarding=no signal-range=-120..-91
/ip address
add address=192.168.1.254/24 comment=defconf interface=ether2-master network=\
    192.168.1.0
/ip dhcp-server lease
add address=192.168.1.1 client-id=1:D0:50:99:55:E0:91 comment=[snip] \
    mac-address=D0:50:99:55:E0:91 server=DHCPIPv4
add address=192.168.1.2 client-id=1:08:D8:33:E2:A4:EC comment="[snip]" \
    mac-address=08:D8:33:E2:A4:EC server=DHCPIPv4
add address=192.168.1.3 client-id=1:E8-03-9A-82-EA-5C comment="[snip]" \
    mac-address=E8:03:9A:82:EA:5C server=DHCPIPv4
add address=192.168.1.222 client-id=1:4C-11-BF-18-D5-8E comment=[snip] \
    mac-address=4C:11:BF:18:D5:8E server=DHCPIPv4
/ip dhcp-server network
add address=192.168.1.0/24 comment=defconf gateway=192.168.1.254 netmask=24
/ip dns
set allow-remote-requests=yes servers=\
    2620:0:ccc::2,2620:0:ccd::2,208.67.222.222,208.67.220.220
/ip dns static
add address=192.168.1.254 name=router
/ip firewall filter
add action=fasttrack-connection chain=forward comment="defconf: fasttrack" \
    connection-state=established,related
add action=accept chain=forward comment="defconf: accept established,related" \
    connection-state=established,related
add action=drop chain=forward comment="defconf: drop invalid" connection-state=\
    invalid
add action=drop chain=forward comment=\
    "defconf:  drop all from WAN not DSTNATed" connection-nat-state=!dstnat \
    connection-state=new in-interface=ether1
add action=accept chain=input protocol=icmp
add action=accept chain=input connection-state=established
add action=accept chain=input connection-state=related
add action=drop chain=input in-interface="TM Unifi"
/ip firewall nat
add action=masquerade chain=srcnat comment="defconf: masquerade" out-interface=\
    "TM Unifi"
/ip smb shares
set [ find default=yes ] directory=/pub
/ip ssh
set strong-crypto=yes
/ip upnp
set enabled=yes
/ip upnp interfaces
add interface=bridge type=internal
add interface="TM Unifi" type=external
/ipv6 address
add from-pool=PoolIPv6 interface="TM Unifi"
/ipv6 dhcp-client
add add-default-route=yes interface="TM Unifi" pool-name=PoolIPv6 request=\
    prefix use-peer-dns=no
/ipv6 firewall address-list
add address=fe80::/16 list=allowed
add address=ff02::/16 comment=multicast list=allowed
/ipv6 firewall filter
add action=accept chain=input connection-state=established in-interface=\
    "TM Unifi"
add action=accept chain=forward connection-state=established in-interface=\
    "TM Unifi"
add action=accept chain=input connection-state=related in-interface="TM Unifi"
add action=accept chain=forward connection-state=related in-interface=\
    "TM Unifi"
add action=accept chain=input in-interface="TM Unifi" src-address=fe80::/16
add action=drop chain=input in-interface="TM Unifi"
add action=drop chain=forward in-interface="TM Unifi"
/ipv6 nd
set [ find default=yes ] mtu=1480
/ipv6 nd prefix default
set preferred-lifetime=1h valid-lifetime=2h
/system clock
set time-zone-name=Asia/Kuala_Lumpur
/system logging
add topics=wireless,debug
/system ntp client
set enabled=yes primary-ntp=216.239.35.12 secondary-ntp=128.138.141.172
/tool bandwidth-server
set enabled=no
/tool mac-server
set allowed-interface-list=none
/tool mac-server mac-winbox
set allowed-interface-list=mac-winbox

Thank you so much. Here is my export. I tried making some changes earlier and clients no longer get IPv6 addresses so I guessed I'm even worse off now than previously. 

freakyweirdo92 First thing I’d suggest is to check with SG users. Maybe hardwarezone or vrzone forums. vrz has quite an active Mikrotik user base. Also try the Mikrotik forums.

I’m afraid you won’t find anyone with 2x1Gb experience here. At least not in a home setting. Btw, which provider? Viewqwest, Singtel?

Anyway, I had a quick look. Everything looks ok. It’s a CCR1009, am I right? The PCC load balancing part looks ok. I use something similar for Unifi 100+50mbps. Bonding to the PC is fairly straightforward so that should not be a problem but I’ve only ever used bonding between 2 Mikrotiks so I can’t be 100% sure.

Since you said it worked ok before, you’ll need to do more testing to discover the cause. For starters, forget the bonding to the PC. Instead, simultaneously test with 2 PCs and see if the router can reach 2Gbps.

yea, the miktroktik router he's using is CCR1009.
he's using viewqwest 2gbps multinetwork at the moment. ok, i'll try ask around in singapore forums.
after testing simultaneously, and able to get 1gbps on each pc, what do i need to check next. 
thanks

freakyweirdo92 First thing I’d suggest is to check with SG users. Maybe hardwarezone or vrzone forums. vrz has quite an active Mikrotik user base. Also try the Mikrotik forums.

I’m afraid you won’t find anyone with 2x1Gb experience here. At least not in a home setting. Btw, which provider? Viewqwest, Singtel?

Anyway, I had a quick look. Everything looks ok. It’s a CCR1009, am I right? The PCC load balancing part looks ok. I use something similar for Unifi 100+50mbps. Bonding to the PC is fairly straightforward so that should not be a problem but I’ve only ever used bonding between 2 Mikrotiks so I can’t be 100% sure.

Since you said it worked ok before, you’ll need to do more testing to discover the cause. For starters, forget the bonding to the PC. Instead, simultaneously test with 2 PCs and see if the router can reach 2Gbps.

sorry, i'm quite a newbie in this. hehh 
how do i do that exactly? 

yea, the miktroktik router he's using is CCR1009.
he's using viewqwest 2gbps multinetwork at the moment. ok, i'll try ask around in singapore forums.
after testing simultaneously, and able to get 1gbps on each pc, what do i need to check next. 
thanks

If you can get 1Gbps simultaneously on 2 PCs that the means CCR is ok at routing 2Gbps. No problems there. Look at the bonding. Unfortunately I don’t have much experience with 802.3ad. The eth ports used are all ok. The only thing I can suggest is to use “transmit-hash-policy=layer-2-and-3” and not “transmit-hash-policy=layer-3-and-4”.

Try transmit-hash-policy=layer-2-and-3 and see if that makes a difference. On the single bonded PC.

Do what? Test 2 PCs simultaneously? I thought you did that already? Or change the bonding to “transmit-hash-policy=layer-2-and-3”?

haha sorry i should be more specific.
changing the bonding to “transmit-hash-policy=layer-2-and-3”

have u check ur ipv6 nd setting??

My apologies for the late reply.

1. From your config:
/ipv6 address
add from-pool=PoolIPv6 interface="TM Unifi"

Interface should be your bridge so:
/ipv6 address
add from-pool=PoolIPv6 interface=bridge

Let me know if that works.

I really don't see anything wrong with it, perhaps you can suggest something?

Sorry my mistakes, i tend to change ipv6 nd setting from "interface=all" to "interface=bridge", just realize it doesn't make any affect, soonwai is much better than me detect the mistakes.

Thanks so much. I changed this and regained IPv6 address on my computer however I still cannot ping IPv6 from computer and IPv6 websites do not open and IPv6 test websites returns negative results. Is it possible I'm still missing something? Thanks again.

You're right, rioven. I missed that. I have mine as "interface=bridge" also. Even though "interface=all" made no difference for me but I think it should be more correct to have it as "interface=bridge".
Dunno lah. Everything else looks ok. Can you ping the router from your PC? Are you using Mac or Windows? How many IPv6 addresses on your PC, not including the FE80:: ones. Can you disable your PC's ethernet port and re-enable it so that it acquires fresh addresses from the router.

I encounter this sometimes. I'm on a Mac. What happens here is that the Mac will get an IPv6 address from the router and works fine. But when pppoe on the router dis and reconnects and TM assigns a different prefix, which the Mikrotik then announces, the Mac ends up with IPv6 addresses from 2 different prefix. When this happens, IPv6 no longer works. This is RouterOS fault because when the previous prefix is invalidated after the router receives a new prefix, RouterOS doesn't send an announcement saying so. It has been like that for years.

Tried changing to bridge, didn't seem to do anything. Using Windows 10 1709. I can ping the router and I can ping the desktop from the router using the IPv6 addresses so that should be OK. I disconnected LAN cable and reactivated wifi to try to ensure I get a different IPv6 address. As per ipconfig, I'm getting assigned 2 IPv6 address but the prefixes does not match the one assigned by Unifi. Does this provide any clue for my situation? Thanks again.