This may sound crazy, but if the inside is dusty/dirty (particularly the 
power supply), try blasting it with compressed air and vacuum it out 
*really good*.  I recently had a problem with one of my systems here 
locking up (not exactly the same problem as you) about every 3 hours; 
pulled it open and cleaned it out in a desperate attempt to get it 
working properly, and it hasn't hung up since.

Jim

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