Optical output issue

I have connected my ATV2 to my soundbar using the optical output and a standard toslink-cable. The soundbar is set to automatically identify the incoming feed. When streaming music through the ATV2 the soundbar correctly identifies the feed as PCM. It does this every time a new song starts, as it is probably identified as a new feed.
The really annoying issue is that the soundbar for no apparent reason also does this in the middle of a song. Each time it does the audio is lowered for about a second. The display on the soundbar says PCM as it does when a new feed is transmitted, even though it is in the middle of a song.
I have tried all the different settings on the ATV2 (e.g DD-On/Off/Auto), but nothing seems to help.
Could this be because of a substandard toslink-cable?
Any other ideas?

Has no one else experienced issues with streaming music coded as PCM from the ATV2 optical out?
In my case, the PCM indicator remains on while non-AC3 audio is being played and no audio "drop-outs" occur. Since I don't use PCM encoded audio files, the only PCM file I have available is a pre-AC3 passthrough Diatonis multichannel file that plays as static on the TV2 but still plays correctly on the TV1.

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Dear All and Creative Gurus,
I search through the forum and read all sticky thread and didn't find an answer, so I need to post here:
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Quote from: HenryW on 22-February-15, 08:13:31
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hualon wrote:
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