Well I finally experienced my first problems with 4.0x last night. It was a confluence of events that I think just stacked up so the DVR couldn't handle it any more. First, it was recording on TNTHD when a mondo thunderstorm blew through. Looks like we lost part of the recording due to rain fade. We began watching the show before it was finished recording. It was the Spurs-Nuggets game. The rain fade break in the program occurred so that it landed in the middle of half time so I tried to FFW through halftime, overshot the start of the 3rd quarter and hit play, then skip-back, then it rebooted. When it booted back up, I returned back to the recording and FFW to the same spot. Unfortunately I hit skip back again a few minutes later, rebooted again. This time, I learned my lesson. Skip back = reboot. We did get one other random reboot. I am still having the problem where it will not record sequential shows on the same channel using the same tuner. Not a big deal, but kind of a pain.