I know this is not the "proper" fix, and I don't even know if it will work, but tonight instead of shutting down the computer, I'm just going to put it to sleep and turn off the monitor and speakers. Then I'll "wake it up" tomorrow and see if it still stays running.
What exactly shuts down in "sleep mode"? Do the fans, hard drive, and other mechanical devices shut down?? In other words, what continues to "wear out" in sleep mode? Bill T.