Hi Arve and welcome.
This sounds like a classic case of the hard disk being faulty, as are most of the fixes for the problems yours is exhibiting especially if it is the original 20GB unit that came with the TiVo. The symptom of sound cut-off with an airnet is exclusive to an airnet and not a wired network card, and it does not accompany with pixelation or lockup - just loss of sound so you can rule that out completely.
My suggestion is go and get that 200GB hard disk and give it another go. If after this you are still experiencing problems, contact George who will then put you in contact with me to organise local warranty service which I do for all of George's TiVo's if it was sold with a warranty and still within the warranty repair period.
If you do not want to get a new hard disk first then you can at least try imaging up another small hard disk (anything over 2GB will do) and see if you get anything different. You want have much recording time, of course, but it will rule out hard disk related issues provided the test hard disk is known to be in good condition.
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