Originally Posted by JayC
This is a common know issue with android devices. Try wifi fixer from the Google play store. That worked for me.
Thx JayC -- this is the impression I've had as well. I had the same wi-fi issue with my DX, but my BB from several years ago and a Palm Pixi+ did not (well, not nearly as often anyway). I was a little surprised/disappointed that the S3 would also have this problem, but if it's something with Android itself it might explain it. Just surprised it hasn't been rectified by now. Otherwise the phone works pretty well in other respects where I had issues with the DX.
Also, sometimes when my wi-fi stops working the 4G doesn't kick in, either. I usually have to reboot the phone. This is bad for me because I receive emergency email alerts from my work 24/7, which is why I notice it. I'll try the wifi fixer and see if that helps. (I do not have Power Save mode turned on).