For some reason, since a few days ago, my 1.83GHz mbp always stops responding after a few hours of operation... When this happens, I always have iChat, Safari, Real Player, Microsoft Messenger, and maybe Mail opened. When I force quit programs the windows will close, but when u look at the dock the black triangle stays. Sometimes even the dock, along with Finder will stop responding. Everything will be fine for a while after a restart, but the problem will occur again. Can someone tell me what the problem is?