wow..i thought i was the only one having this issue...fyi, i hav been using tp-link 841nd router for the past 2 years..i have encountered tis problem more than 1 year ago, suddenly wifi keep disconnecting, internet speed slow..i thought it was my router's problem, but when changed back to tm's d-link router, it had the same problem..but after waited for few days, the problem dissapeared and the internet speed back to normal. and now the problem occured again 
i think its not about the d-link router's fault, it's more of the internet speed problem, cant really confirm though...i have call up the unifi service line and the operator told me my line has no problem, she even help reset my line...but the problem is still there...weird thing is, when trying to use wifi closer to the router, the speed seems to be 'ok'...hmmm..weird

Using the internet close to router doesnt solve it but ethernet cable does. It happens only at night according to my cousin.

Ireally dont know what is causing this problem. Need sifu's suggestions, new router will help rectify this issue?

My problem is the wifi does not work even if i use my laptop beside the router, regardless of its distance, it still has shitty speed. However, if i connect using LAN, it works fine, perfectly fine. And this happens like quite frequently, like for now, the wifi is working fine, yesterday night for about 4 hours i need to use LAN cable to connect to the internet.

So my question is, what is the problem? with the wifi signal? Router settings? Router problem?

i dont think anyone could help unless they really encoutered this problem themselves..until not i also i cant figure out whether is the router's setting problem, unifi problem or etc  ...just hope that things will get better in next few days

LAN works fine for me too when the WiFi isn't working! According to my cousin, it happens at night mostly and usually randomly throughout the day, he was playing Battlefield 3 earlier, his ping spikes to 999 - 1500ms and then back to normal, then spikes again after some time.

WiFi signal/settings within 192.168.0.1 control panel cannot modify. As above in my first post with picture attached, I tried to modify the setting and I get "No changes are made, continue?"

I think it's router faulty or entirely, the router itself is not properly made by L7. Are you using L7 router?

That is DIR-615 I believe. DIR-615 should be a better router than the L7. I am using it with DD-WRT firmware ( http://unifi.athena.my/ddwrt_guide.php ) and have no issues except I can't watch HyppTV.

if you are currently using tm's d-link router, u can try change to tp-link router or asus, the coverage is much better..but still, it doesn't solve the problem we mentioned above no matter which router u use

if your problem is just the wifi range, then u can try to get another router to solve the problem..but if the problem is more than just the wifi range as mentioned in post #44, #45...then getting another router wont really solve the problem...anyways..i think my connection is back to normal now (tested with both tp-link & tm d-link router)

It isn't my problem but cousin's lah, basically his issue is just WiFi goes cuckoo randomly, connection drops, authentication (mobile phones) fail. Only ethernet/LAN would work for that time being, not to mention his PC's ethernet card is somehow dead

Hi bro. I have just installed a new router, ASUS RT-N12. Everything is better than the L7 so far now awaiting the WiFi hiccup.

Got it for RM155 from Dynamite Computer @ Digital Center, Sunway Pyramid.

IdealTech on Lowyat Forum sells for RM145 excluding delivery.

Setting up is easy as ABC, I will guide you a little if you're interested in getting one too. So far, the WiFi is fine. I will have to ask my cousin sisters (who complained about the WiFi drops)

1) Make sure you download THIS FIRMWARE file
2) Follow this firmware flash guide FIRST. http://klseet.com/index.php/asus/asus-rt-n...factory-restore

*I didn't flash, I sat there wondering why I couldn't connect for 3 hours *

3) Setup guide here. 100% straight forward, no complexed stuffs. http://klseet.com/index.php/asus/asus-rt-n...irmware-a-setup

^ I skipped some parts in the SETUP GUIDE ; they are : disable WPS, changing LAN IP, DoS Protection, QoS, Port Forwarding.

Now all is good. I am going to try BF3

Exactly why you need the custom firmware (just follow the guide exactly for flashing), for UniFi and HyppTV more stable is probably flashing the DD-WRT onto DIR-615? I'm (at home, own UniFi) using the DD-WRT on my DIR-615, stable or not it's normal lol. Got flash custom firmware = didn't flash since my internet is fine.

However, my cousin's case (the ASUS RT-N12) is 140% no issues. It's all fine now onwards. His sisters say ok already, no more hiccups, he has been using for 2 days now, still okay.