Same here, the problem is very intermittent. In fact it has only happened a couple of times when NOT using my Bluray (DirecTV and Chromecast). Even with the Bluray it doesn't happen very often with one exception...
When I am using my P90X DVDs it seems to happen several times during each session. I can't imagine that this has to do with my jumping around causing cable connection problems because the components are in a built in wall unit that is extremely solid.
Another idea is that there is some sort of electrical disturbance causing a brief disturbance. I mention this because one of my two PC monitors in my home office will "blink" intermittently as well. I realized that whenever I rub my feet on the carpet and touch one of the walls in my office causing a "shock", my monitor consistently blinks. So the theory is that an electrical disturbance is causing this random issue to occur.
All that said, I think the most likely issue is with the HDMI cable. I'll try changing that first. I'm not familiar with Redmere cables, what's the deal with those? Are they better than standard cables?