The screen goes blank then the Apple logo appears, after a few seconds it returns to the home screen and whatever I am doing is lost.It has been doing this every couple of minutes all day yesterday, then this morning it suddenly returned to normal. What caused this and how can I diagnose/repair future issues?
Added (1). The phone is switched off all night and it started when I switched it on yesterday morning.
>>> My iPhone 3GS has been randomly restarting itself!