I just had the same problem. Happened over night for no reason at all and then the following day it would take 20-30 seconds to dial a number after pressing the greeen button. Phone went back to the factory, tested in lab and p***** (why can't i type the word p a s s e d)????. Told them to field test and the problem came and went so they said they would replace the board in it. Took so long for it to arrive they just replaced phone for me