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USB Audio issues with repeat INCOMPISOOUT interrupt

YDong.11
Associate II

I'm having trouble implementing the Audio Device Class example from the STM32CubeMX tool on a STM32H750VBT6. 

When run, the USB appears to enumerate properly, installs the default drivers (Windows 7, btw) and shows up properly as a playback device. However, attempting to use a test tone or play through the device in any way reports a failure (no further information forthcoming).

Debugging, I can see that the USB interrupt is being triggered very often, with the flags INCOMPISOOUT (every time) .

What's the reason of INCOMPISOOUT?

And how to fix this issue?

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