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Failed to request power down: -121

Hi all

I've built a "soundmachine" - a keypad with 60 buttons which play a sound on button press. I do use a AMP+ for this with a speaker attached. Everything is working fine - until a random moment where the python app is still running an requesting the output of a sound, but nothing to hear from the speaker. I checked dmesg and I found this entry at the time when the error occours.

[244302.268322] pcm512x 1-004d: Failed to request power down: -121

Does anyone have an idea what that could be? Or what the reason could be for that? Any hint is much appreciated.

Thanks in advance!

P.S.: Any more infos needed? I'm happy to share more details, but honestly, I don't know what info would help.

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