My 4s can barely connect to Wifi and disconnects very quickly. Local repair shop seemed reluctant to offer to fix it because he said problem not guaranteed to get better and basically said the problem is caused by the heat generated by the phone. Maybe that's BS, not sure. Anyway it looks like a replacement part only costs a few bucks off of eBay and iFixit sells the special screwdrivers, etc and shows how to do it. Has anyone here done this themselves? And did it work? I might give it a shot.