We had the new x1 box installed and are having issues with our panasonic HTB550 sound bar. When the stereo is on the sound cuts out to the speakers randomly, while the subwoofer continues to work. This only happens when watching live tv or on demand, not when watching the DVR. I have tried every way of wiring the system, including optical only connection between the x1 and the soundbar but the problem still exists. Comcast came out yesterday and installed a new box and basically said there was a compatiblity issue with my stereo and to get a new one. They couldn't tell me which systems would be compatible. We have the sound bar wall mounted as two speakers on either side of the tv above the fireplace and I really don't want to have to reconfigure this. Any suggestions???