Samsung UN46EH6000F strangeness

[rlovison]

OK, after running this set for a couple of days to see if all is well I noticed something peculiar upon startup. Every time I turn the unit on, I get the input message bar at the top left of the screen, the DISH signal appears a second or so later and then after 20 to 21 seconds, the video goes black for a fraction of a second and then re-appears. The audio doesn't blink. This happens every time I power on and the 20 seconds is constant. I've had the set running for long periods of time and never encountered any blinking during operation after startup. I upgraded the firmware to the latest version and I thought of re-installing though it seems I can't through the menu. I've never encountered this behavior in a flat panel. Could this possibly be normal for this set? Samsung support was of no use.