WiFi strength dropped on 2 bars suddenly in the last 2 days

[kuhinja]

On my android 4.2. tablet, in the last two days, WiFi shows only 2 bars and with that I can't open any website.
I'm placed next to the D-Link Router, only a wall is splitting us as it was before.
I tried WiFi Analyzer and transferred signal to a free channel, as far away from my neighbors, but still the same.
I used also WiFi signal Booster from Google Play, still no luck.
What can I do now? Please advise.

 

[B. Diddy]

Welcome to Android Central! Have you already rebooted the router? See other ideas here: http://forums.androidcentral.com/am...roubleshooting-wi-fi-connection-problems.html