I have had the same thing happen to me and it is very frustrating.
When I called tech support, they told me that it may be due to "voltage variations", and suggested that I plug the DVR directly into the wall (as against using a power surge protector). I did that, but occasionally I still had the same problem.
Now I have a 722 and have not experienced the issue, but I've only had it for a few weeks.
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