Things to try in this order:
First point of call with any freezing TiVo is to try imaging up another hard disk and see if it is any different. Any size hard disk will do above 2GB.
Next thing to do is disconnect/remove the network card to see that it is not an external attack locking up the TiVo.
Next is possible power supply issues.
After this you are possibly looking at need of seeking further advice.
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