I have a 612 receiver and live in the Springfield, MO local market. When I tune my 612 to local channels 021-1, 021-2 or 021-3 they all show 90% signal for about 3 seconds and then drop to zero. I do not have this problem with the other local digital channels and if I switch to view the channels directly from my HDTV tuner (same antenna) or from another TV with a converter box with rabbit ears the 21 stations stay at a strong signal. I called E* and they concluded that my TV tuner is better then the tuner in the 612. Anyone else experiencing this?