I did the same thing, Moving Foxfire from the SD card to my 32 GB internal did the trick, I had the same experience with Ad Away. I'm not geeky enough to tell you why it happens.
The only problem is that there are a lot of " wifi managers " on Google Play. I have been trying them randomly, based upon what I can glean from their rating and the description the author gives GP.
I'm keeping my fingers crossed!