Tried to record today's NASCAR race. I added 1 hour to the 4 hour program for a total 5 hour recording. The recording stopped for no reason at 3:42 and the light went out. I just happened to notice it at about 6pm. Luckily the channel was still on ESPNHD and the buffer picked up the remaining 18 minutes. I hit the record button and managed to salvage the final few laps. FYI: No power outage. Any ideas?