As a test, unplug the HDMI cables from the TV. Now remove AC power from the TV and wait 10 minutes. Connect AC, then the HDMI that was giving the flash and re-test.
If not, call the TV's support line and ask what next.
I have a Pioneer VSX-40 receiver and a Vizio VX37L TV. I have my Verizon FIOS TV coming through my receiver and an HDMI cable going to my TV. As I'm watching either live TV or something recorded oon my DVR, my television will flash a blue screen for a couple of seconds. the sound through my receiver never hesitates. I checked all of my connections to see if anything was loose, and they were all attached securely.