New problem, out of the blue for no reason. BI version 5.8.9.6 (and 5.8.9.5), Windows 10.

When a camera detects motion and saves a video clip the camera then freezes and I have to close and restart BI to get it working again. Started doing this recently for no apparent reason. Happens with all the different cameras I have. I haven't changed any settings. Hardware acceleration is off. Any ideas?

Forgot to add, BI still runs when this happens, it's just the camera that's been triggered that has frozen.
The log file doesn't show anything.