yea every since mine came back from repairs,over heating and cracking screen,my home wifi has been not staying connected to,i look and its 4g,ive read a a thread that it could be your wifi ghz and the megas ghz on connections,mine will connect at anyother wifi but my house router has been giving issues or the phone,ive not checked my router to see if things match up,but there is a thread about this issue

 

i updated to kit kat and it seems to be doing better than before,but ill prob. try the hard reset too,with the update and hard rest,hopefully it will solve the problem,but kit kat seems to have fixed it so far lol