I have a Trendnet TEW-812 DRU router. I've been experiencing problems with my mobile devices for a while now. I have three cell phones and two tablets that cannot use wifi even though they are connected. It keeps saying "wifi connection unstable." I have two laptops that work fine as well as a smart TV that works fine. I have already done a soft reset and a hard reset which fixed the problem for a couple of days but it keeps coming back.
PLEASE HELP