I have seen a lot of black for a few seconds(HR20-100) on ABC, CBS and NBC but it also shows up on my old Samsung SD DVR. I tried an RCA HDTV rabbit ears the other day connected directly to the TV and see the same issue(sporadic loss of both A and V for a few seconds) on the digital channels. Then I used the TV's signal level monitor and watched it frequently change from 3 down to 0. I'm only about 6-7 miles from the antennas but my reception is pretty poor(analog unwatchable) but since using DirecTV is also having a lot of problems too I thought it might be relevant. It appears all three network stations around here are having problems with the digital transition.