Hello, this has happened about five or more times in the past month. and seems to be happened more often... the phone freezes completely, and i hold down both buttons to do a hard reset... it goes as far as the rotating thing, and then nothing happens. i wait for several minutes, sometimes many, and then do another hard reset... this goes on for sometime until it finally works. .... what is happening? should i take it in? very frustrating.... ... is this problem known to be related to heat? usually happens in cars... though only about 85-90... r.