Update: I finally got ahold of a sympathetic tech, who ordered a replacement quantum DVR set top box. That fixed my problem, at least for now (your mileage may vary). There may be some advanced technical explanation, but anyone who has owned a computer knows that strange recording behavior is a classic sign of hard disk failure. If you have this problem, and it isn't fixed with a few resets, ask, beg, or whine for a new set top box.
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