After working fine since the day I bought it when it came out, my iPhone 4 has not been recognizing my home network the last several days when I return from work. I tried re-entering the network password, which did no good. I told it to forget the network and re-entered all the information. That still did not fix the problem. The only thing that worked was actually changing the password on my network. I should say that my home computer also uses the same wireless router and hasn't had any problems. Does anyone have any idea what might be wrong with my iPhone?