My phone has started somthing very odd? I will be in the middle of a call, and all of a sudden it will lockup. I then have to pin reset the phone to use it again? Also for some reason I have noticed that it does not want to turn itself off from time to time. It checks email every 30 minutes then closes out, but at night when its charging, I might get up and it be on, and will not turn itself off even if left alone for an hour? This becomes a problem when this happens when not charging. I dont notice untill the phone gets hot or the batter indicator goes off?

Any ideas?