Did you try using the 5GHz band? Don't bother using the Asus N12HP, as it does not support AC, and therefore could give you lower speeds. If you are using the 2.4GHz band, that could be the problem as 2.4GHz is very congested nowadays.

5GHz band has better speed and less frequency interference but drawback is shorter range and bad wall penetration.
2.4GHz band has longer range and better wall penetration but drawback is slower speed and greater frequency interference.

It's good that you put different SSID name e.g. myWifi2G & myWifi5G so you could connect to 2.4 for devices far away from router.

See bro warrior reply above. It is the same thing as what I would say to you. See here for further explanation on AC and other various wireless basics:

http://homenetworkadmin.com/wireless-b-vs-...-ac-difference/

Just installed unifi30 with the c1200, noticed it quite unstable and suka suka fast suka suka slow or no signal... Alwiz unstable connection and felt it slower than my previous maxis 10mbps router. Aduhai

It won’t give you lower speed, just that you can’t use AC. Just try using the ASUS N12HP again, and if you can get full speed at 2.4GHz, just change router.
Try ticking the ‘802.1Q’ box. This particular router does support the TP Link Tether app, but only for V1. Yours should be able to support the Tether app. See here: http://www.tp-link.com.my/tether_compatibility_list/

TP Link AC1200 has had a lot of complaints from forumers here, so if you can get a better router, it would be good to change to a more expensive TP Link router or an Asus one. I wouldn’t bother calling TM as they won’t change your router to a better one, unless you buy your own router.

AC is only 5GHz. 5GHz have faster speed and less interference but its signal strength and coverage is not that good as 2.4GHz, so no, it can’t reach from upstairs at the back to in front downstairs. Changing routers won’t help as 5GHz has very low coverage generally. See here for a more detailed explanation:

https://www.lifewire.com/is-5-ghz-wifi-bett...-2-4-ghz-818293

If you want another ASUS router, I would recommend the ASUS RT-AC1300UHP.

See the review here:

https://www.blacktubi.com/review/asus-rt-ac1300uhp/

It is a bit pricey through, from RM500 - RM600.

If you want something cheaper, try the Asus-ART1200G+.

You can still have 5GHz for N, but not AC. See here:

http://homenetworkadmin.com/wireless-b-vs-...-ac-difference/

I don’t know if it will be good enough for 100Mbps as it depends on interference and congestion in your area. It might not though, so keep that in mind. The router they provide is not that pricey, to be honest, and it is one of their mid range models. There are more expensive routers out there. You can flash the router however you want, but you are on your own regarding that.

My friend, I believe you router might not support speed above 100Mbps since it comes with FAST ethernet port. If you're using 100Mbps connection, if you use the router, the max speed you might get is around 80 - 94 Mbps and not 101 - 104 Mbps.

I am an ex user of archer c7v2 (sold it already due to weak wireless signal for both bands) and c1200 (ditched it because whenever I download using idm, it delays 1 minute before download any files including images) and replaced with second hand asus rt-n56u router. That solves the problem. No need to wait for a minute to download. Even aus firmware cannot save c1200.

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Pros of C7

- no reboot issues
- not getting too hot
- able to handle 20 devices at a time

Cons of C7
- lame ui
- weak wireless signal especially 5ghz band
- buggy firmware

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Pros of C1200
- good wireless signal (even better than c7 to be precise)

Cons of C1200- firmware issues (too many bugs)
- random reboot (although aus firmware does improve the boot up time)
- overheat issue

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But, in future,  I might avoid lower end tplink models.

Now i am a happy user of asus n56u. 

The best part is, asus n56u still receives firmware upgrade although it has been 6 years the router was launched into the market.

My friend, hereby i attach an image for your own satisfaction.

For further clarification, you can go here to check.

I would say both are not that good. But, if I have to choose, I would choose the DLink as the AC1200 has had many complaints about stability.

I agree. Trust me, if you're a heavy user, e.g. torrenting, your cpu load usually shoots up to 100%. I wonder do tplink did a proper testing before releasing the firmware. I believe the hardware used in c1200 is good. But how come such crappy firmware passed the testing?

Another thing I found out about the TM tplink c1200, DNS server is locked to TM DNS server.( Even if you have changed to Google DNS or others.)
Haven flash it yet tho..

Using back my old dlink orange router.

However, there is downside of the fixed issues. 
n56u has gigabit lan and a wan port. Definitely it supports 100Mbps bro.

I flashed my c1200 with aus firmware. Tbh, it just able to solve the boot up time issue. it takes 4 minutes rather than 5 minutes. The good side is, the wireless signal were superb.

tbh, I flashed my c1200 to aus firmware to avoid the "suffix @unifi" thing. The boot time does improve by 2% ONLY. Yesterday when I was having free time, i updated the firmware of the router to the latest version of aus firmware (before this using an older version of the firmware of aus). I must say, after upgrade, the situation even gets worse. Hahaha. It takes long time to connect to the internet. i guess around 6 minutes. The cpu load shoots to 100% and when I download torrent or using IDM, they are not responding to the server (takes around 1 to 2 minute) before they actually starts to download.

Wireless coverage for n56u average only. So i sell it already. Currently looking for a replacement router. But running the router in padavan is the best.

I am an ex- archer c7v2 user. I sold the router due to the wifi is quite weak. It has an awesome spec, but average coded firmware causes the wireless to be weak. First of all, what router you are using currently? C7 or C1200? Second, why you want to flash to tm's firmware? If I were you, i wont do such move. You can enable the beam forming or disable it. You can refer here.
If you're using archer c1200, i will say, if c1200 has a stable firmware, sorry dear c7v2 users, this c1200 will be a beast. Since the firmware for c1200 is buggy, hence it limits the router's performance. The router comes with an awesome specs. Yes. Even Im using Archer C1200(EU)_V1_170616 firmware. I disable some of the features to make the router to be stable for time being.

I disable the usb sharing, print server. Thats all. Some say by disabling SPI Firewall, the cpu load will be less. I personally test it and find that, it is same as I jump into a sea full of sharks. The performance of the router when spi disabled were slightly better. I turn off the led's so that the router don't overheat (although i put a cooling fan).

The only thing I like in c1200 is, the wireless performance and we can turn off the led's. For such router for the price, i can say okay. If and only if c1200 have a stable firmware.

I see. I invest rm80 to buy cooler for my router. I turn off the led so that it looks nice moreover, the led's are not blinking. Hahaha.
Is the newer version of c1200 is better than the c1200v1?

Don't hold your breath. There is newer versions of the C1200 out already, and the problematic version is v1, so doesn't look like they will bother with v1.

I bought this.

Not using the C1200. I just know there are newer versions out there, for sale anyway. You won't get the newer version from TM, that's for sure.

I would recommend you get the Asus RT-AC1300UHP, instead. See here for review: https://www.blacktubi.com/review/asus-rt-ac1300uhp/

If me, i wont mind about wireless. I will select a wired router because I very seldom use wireless. Only to open whatsapp or insta in iphone. My rog laptop always sleep and i open once in a week to update the software then close back. I rely fully on wired connection. Thanks to bro soonwai for suggesting me to get a Mikrotik router. So i purchase it and I satisfied with the performance. For the price of rm260, this can be compared with high end asus router. The good side of the router is, its small and cute and fit even at the compact place (not taking much space). To make my parents house to have wireless connection, i put TP=LINK TL-WR841N as an access point. It solves my problem.

As for the suggestion, i would recommend you to go for asus router (dual band). If you have the budget around 700 to 800, then you can purchase tplink c3150 (MU-MIMO) router.
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Of you can purchase the mikrotik router for rm260 then use your stock unifi router as an access point to provide wireless signal for your devices. I did like that for my parents home network. I let mikrotik to be my main router, then i use cheap tplink router to be an access point. 

Happy New Year to all of the forumers here.

Bro, if you want to depend on the stock router supplied by tm, then you will face some issues with your good time with internet. Nowadays, all router comes with wireless functionality. In the first place, i never thought of buying mikrotik router because i plan to buy an asus dual band router or a tplink c3150 (saving money), but after read some reviews on mikrotik product, and their routerOS, i must say, it is the BEST router i ever used so far. Just imagine, you get 256mb of ram instead of standard 128mb for the price of rm260. I bought this router as my main router because i using more wired connection than wireless. the only devices that uses wireless is 3 laptop (rarely used) and 4 smartphone (always use). So i get a cheap tplink router to broadcast the wireless signal. I've been using the mikrotik router for about 1 week, until now i haven't face a single problem like reboot or hang during torrenting. I highly recommend mikrotik routers for their hardware and their famous os, RouterOS. Or if you wish to use more common brands like tplink, then i would advice you to save some money and buy tplink c3150v2 as suggested by SilentVampire bro. That router has built in antivirus. 

Desperate time calls for desperate measure. 

I'm on the beta firmware for C1200v1 EU and it is rock solid for almost 24 hours now.

No disconnect / loss of internet that requires a router reboot
No broken wifi (Wifi is turned on but some devices cannot connect)
Memory usage is currently @ 27%
Cpu usage fluctuates between 20-ish% to 100% - and I'm seeing lower low with this new firmware.

Interesting how this performs over the next few days.

You will face problem with accessing local devices with this beta firmware...