Something almost identical is happening to my UR12 after switching to Windows 11 (ASUS PRIME B660M-A D4 motherboard). With any audio application the audio constantly fades out every 10-15 seconds. I have every driver up to date.
UPDATE: I fixed it thanks to this thread: UR22 mkII - Audio dropouts problem - #144 by Matthew_Cuomo
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Change the Power management mode setting in the NVIDIA Control centre: change from Normal to Prefer maximum performance
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I also disabled the Nvidia Virtual Audio Device