Sorry people, I totally forgot to mention the setup - RP-6 and antenna are right one shelf up above the Blu-ray and Dish DVR and, the RP-6 is also on the same shelf as the modem and wireless router and X-Box360 (hardwired into router)- all crammed behind the center channel on a 4 foot wide tv 3 shelf stand - never happened until the 3600 came into play, and only blinks when the Blu-ray is on, and not all the time at that - sometimes it just stops for no apparent reason and doesn't come back on until next time - is it doing any damage because I can live with it until I move and relocate the antenna to a better place - thanks again for the advice everybody