Audio sync issues - only HD channels affected

Hello everyone,

just want to know if there is a known issue with HD Audio sync issues. I can be watching a movie on HD channel, and after a a few moments the audio sync happens and it feels like I'm watching an old Kung-Fu movie. To temporarily fix it, I have to change the channel and return to it. This really gets annoying cause it happens on multiple occasions daily. I've rebooted every box, even had the cable box replaced.. Any ideas?

Thanks in advance,

Paul