Have a Motorola QIP7232 in Philly area Verizon FIOS. HDMI cable from QIP7232 to receiver (pioneer vsx84txsi). Been working fine but experiencing loss of audio on 1 HD station (506 WPVI) with only certain programming and/or commercials. SD station works just fine. No other programming seems to be affected. Researched and have tried various suggestions like making sure language setting is correct, but no joy. Rebooted STB, etc. Any suggestions are appreciated.