Looks like the D: drive is disconnecting at some point.
The D: drive is a physical disk or a mapped network drive?
In the latter case, your pc is connected with a cable or via wi-fi?
In the latter case, probably your router is incapable to manage big wi-fi transfer rates.
To confirm that problem, you should also be experiencing a general network disconnect of your pc.
To answer your question. the D drive in this case was a 1TB Western Digital Black drive in an external caddy attached by USB C to the Win 10 PC.
After I resumed the transfer I did a comparison and it appeared that all was in sync. I also played back the video file that was mentioned in the error and found it to be ok.
So all good. I just wondered if I'd hit a current issue.