No audio in windows app on some not all videos after a reboot

Just looking at it won’t help. What did you find out about it? What are the current settings?
Did you upgrade your Windows 11 to the newest build 24H2?
If so, are the affected movies using the AC3 codec for audio? See [BUG] Problem with (E-)AC3 Codec and Windows update 24H2 - #59 by rhalibur

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