I have just bought a Philips 42 PFL7603D. I have my Xbox 360 plugged in via HDMI. I have the TV's SPDIF out going into my BOSE Lifestyle 8 Series 2 SPDIF in. But the sound when I play games is not working, it is jittery. DVD play back via the xbox works fine. Any ideas of the problem? Thanks in advance!