Macintosh26, I do not know whether this topic! Or tried to, but I have such a problem was on the plate Goclever Tab R76.2 also fell off Wi-Fi just decided:
Follow the path:
Setting forth Wi-Fi Then, the vertical ellipsis in the upper right corner! Further, additional settings and / or (function) Choose Wi-Fi in sleep mode! We put a point on point "do not turn off"
After that restart the tablet! And personally, I have the problem disappeared! Wi-FI worked steadily without failures and tears!
P.S. Firmware has been based on Android 4.1.1