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Sound dropouts, LED dimmed

Hi, since a few days I have extreme sound dropouts (from a few milliseconds to several minutes without sound) with my DAC+ on my RPi2 running the newest OpenELEC Nightlies. Always when the sound drops, the LED is much darker (I measured the voltage of the LED: 3,2V when working, 1,6 when not working) I looked into the datasheet of the PCM5122 and noticed that the GPIO4-Pin (to which the LED is attached) can indicate several things. What excactly does the LED indicate? And what  could be the problem of my issue? Could it be a hardware problem?

 

Thanks for your help.

Martin

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