Hood,
Seems more like a software thing to me. I've had problems all along with the machine booting up in a funky state, and re-booting always makes it happier. It's not like it's flaky. Once it's up and running well, it'll run well forever. It just sometimes boots up in a wierd state. Mach is the only app. I've had a problem with. The machine is a dinosaur - circa '99 or so, and will be replaced shortly.
Regards,
Ray L.