I'm not sure if this will help any of you, but, try it, it might...I had router issues and reset the router, then my iPad seemed to drop the wifi connection every time it went to sleep (or most of the time), I thought I tried everything, but try this (it worked for me):
open settings app, click on wifi, if you are not connected click to connect, (otherwise skip this step), now with the wifi connection active click on the blue arrow button on the right, it will show you the wifi settings, click on "Forget This Network", (are you sure?, yes), when it disconnects turn wifi off, turn wifi on again, click on your wifi to connect.
I did this and it no longer drops my wifi connection at home.