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I think you have interfering processes which take control of the NIC and return it to managed mode. This is known behavior - the airmon-ng script for preparing an interface for monitor mode support includes tools to handle this case. See:

https://www.aircrack-ng.org/doku.php?id=airmon-ng

There are ways to create a virtual adapter and capture as well as use the main adapter in managed mode. I usually suggest not to do this - strongly prefer an independent adapter dedicated for capture.