Audio Drop outs on Win10 w/ Bifrost DAC (USB) [resolved]

Just information for others:

Recently upgraded an endpoint, This endpoint is a WIN-10 sys with Bifrost Dac. The Dac input was using unison USB. We experienced audio dropouts, Roon messages during drops were pointing to hardware issues.

The remedy was to uncheck exclusive mode in the device setup.
God knows why!!! but it works now.