I think I'd start by REPLCING the "V" drive
But first Reformat as instructed, then download a drive test program (The manufacturer's is generally good) and let it run for a while, Use the deep scan and let it run overnight.. Or longer.
Next: One of the issues with some backup programs is they do not check for space on the target (Backup) drive, so if your back up takes say 2 TB and the Target drive has only 3 TB of space, when you do the NEXT back up it runs over, this is because even if you use "Save with replace" it saves THEN deletes the old, and you do not have the room. Hence.. Crash
This crash can get into the part of the drive which SHOULD be protected, the part that holds the name and ID. I've seen it happen with smaller drives.
Suggest a bigger Backup Drive.