I have a problem when watching the HD TV channels on Fios. Anytime I watch an HD channel occasionally and random the TV will black out and then come back on in a second or 2? It only happens on the HD channels because I have checked and paid attention on the regular channels and it don't do it. This just started within the last few months and I have had Fios for a couple of years? Any reason why this happens only on HD and when I DVR shows on HD it is recorded and does it!