the problem I have been having is that my touch screen becomes unresponsive when using the phone app. For example if I have an incoming call sometimes I am unable to switch calls due to the screen being unresponsive. Also I can almost never push the end button as it doesn't respond. I tried a full restore to no avail and I really don't want a refurbished phone unless absolutely necessary. So I was just wondering if it was one of the updates that could have caused this since the problem recently started when I upgraded to 4.3. Also my phone is not jailbroken and is still in mint condition never dropped or anything like that. Any suggestions?