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I agree that running "top" is an excellent recommendation, and that you most likely have one or more runaway processes. One other thought is that if your machine consistently starts acting up after X amount of time, you may have an overheating problem. Overheating is a common source of instability, and if your system typically starts going south after 5 hours, give or take, you might want to check that all the fans are running properly -- J.W.