Yolo's repair trick by heating up the wifi chip for about 15 seconds up to around 400 degrees F does work, but it seems to be only temporary because Apple has not corrected the iOS 7 programming program..which is the root of all the problems it seems. I followed Todd's advice and only took out the battery and the EMI shield.....isolating the heat source to the wifi chip as much as possible does not hurt. I had to repeat the process two weeks later because it most likely overheated again. Thanks for the great tips!