can any one shed any light on this extremely annoying problem with my 65, every so often it switches itself off. (battery not full, switch not pressed or any other stupid simple explainations like that please, im not a moron) but it seems to happen when somone calls me, never on outgoing call, only incoming. I.e it happened twice in one day while I was writing a text message and someone was trying to reach me both times. I have had the soft upgraded but this did not cure it, now I'm beginnig to think PA. any advances on my theory?

Dave.

p.s oh yea, when it switches off it just goes OFF, no light timeout, no shutdown, nothing. like taking the batt out.