Apple Tv sound dropout with optical cable

Hi there,
First of all Merry Christmas to everybody out there...
I received yesterday for christmas the latest apple TV.
I connected it to my tv with HDMI cable and to hifi, bose home cinema lifestyle 28, with optical cable.
Sound through HDMI cable is perfect but...playing music from macbook pro or iphone 4S through optical cable is a problem.
I have sound drop outs for a second now and then...
Cable is well attached on both sides...
What do i have to do?
Kind regards,
Laurent

I also have this problem...  Any ideas

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