Sorry for bumping a "not so new" thread, but my screen started acting up yesterday. I'd just downloaded Angry Birds and the screen stopped responding including the touch buttons. The side buttons still worked so I could start the camera, increase and decrease the volume and lock the phone. Sometimes it helped to lock the phone and unlock it again, sometimes not (I could lock the phone but then not unlock it again since I could not do the sweep upwards. I had to do a soft reset.).
I uninstalled the game when I finally managed to unlock the phone, but that did not help. I've done multiple soft resets and nothing changed. This morning I finally did a factory reset but that did not help either, same problem after 2 minutes. I noticed that sometimes after a lockup, it could help to just let the phone rest for a minute or two and then it would respond again.
In one final attempt before I was about to go back to the store where I bought the phone, I turned the phone off, pulled the SIM-card, waited about 30 seconds, inserted it again and booted up the phone. It haven't frozen since (knock on wood)!
Unfortunatly I'm not sure that this is a hardware error so switching the phone probably would not help. I hope for a SW-update to solve this.
If it starts again I'm goning to try to exchange the SIM-card and see if that makes any difference.