I have a strange noise problem, some HD channels (1,2,3 Netherlands HD) digital audio stutters regularly. My setup - Philips 42pdl7906H/12 with CI + - Input Ziggo CI + - amplifier connected with optical cable This problem only occurs when I use the dolby digital audio channel and only the rows 1,2,3 HD channels dolby digital on the RTL and SBS HD channels works fine.