I also find my Motorola box being reset, I do have a firewire cable connected and the problem occurs only when I shut down the computer.
I will be watching, either live or recorded and I shut down the connected computer and the PVR gets reset.
The guide is cleared and the currently being watched recording is forgotten because I cannot resume playback where I was viewing when reset.
This is a new problem for me and could be a firmware update issue as it never happened up until a month or so ago.
It has happened a few times, I have now disconnected the firewire cable and the problem has stopped.
Perhaps this "problem" is by design, or maybe it's another "bug" that is occuring due to some other reason ... come to think of it this seems to have started right about when I brought home a Shaw Extender box.
I may disconnect the extender box and see if the firewire reset problem persists.
Although, the almost limitless space a TB drive brings really has me not capturing much with the PC lately.