I've been running 2 hdpvr's side-by-side from a scheduled batch file using rctvcap. One is a fan-in-the-top-modified C1 and the other a D2 (bought last week, when EVERY body else is receiving E1's

). One is connected to the YPbPr and AC3 loopthroughs of the other... fed from a cable box sitting on ShowtimeHD. Essentially capturing for 1hour, repeated every two hours, thus a 50-50 duty-cycle of recording/rest, 1 hour each. The boxes are scheduled 30 seconds apart to avoid usb loading issues. There seems to be no rhyme or reason... the C1 SEEMS to perform a bit better, MOST of the time it captures more consecutive recordings before locking up. BTW, the brand new D2 wouldn't pass more than 2 caps before locking up until I stood it on its side

Anyway, I agree that there's more to it than heat. BTW-2, they are both on the same usb controller in device-mangler, seperate from any other usb device....