i had the same problem just last night, i pulled both the battery and sim card out for about 6 hours and it seems to be working now.
Ill repost if it messes up again and I have to hard reset
PS I noticed when i turned off the phone it appeared as if an image had been burned into the lcd screen, but when i went to put the battery back in it was gone. its possibly another symptom, could just be that the phone needs to b turned off and left off every once and a while.
idk, just a thought |