I have a Roku Ultra 4660-X and a Samsung Receiver HW-C700. When I plug the Roku into the Samsung receiver, everything works well, except for about every 2 minutes or so, my TV flashes black for about 2 seconds. Anyone have any idea what the problem could be? When I plug the Roku directly into the TV, I don't have this problem. So, it does appear to be an issue with the receiver. Not really willing to toss the receiver though as it's a good 7.1 channel receiver.