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AMP2 stops playing sound after a few hours

My HiFiBerry stops playing sound after it runs a couple of hours. The LED D2 is on (green), the LED D1 is off. The DAC is still recognized by alsamixer. But when I play any sounds, the system does actually play it, but I don't hear any sound. A reboot of the raspberry helps and the sound is working again - for a few hours.

Any ideas, how I could further debug this issue? What could I check?

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