Lots of recent autodismount problems
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Since updating from 1.24 Update-6 to 1.24 Update-7 on Windows version 1909, I have had perfectly fine encrypted drives start to autodismount at random times. I believe the drives had been created with Update-5 or Update-6, one of those two, and they never had problems like this in the past. The dismounting tends to happen when copying files over to the encrypted external drives, but can also happen when browsing data that is already contained on them. This happened consistently when using different cables and three seperate drives. The filesystems seem to be fine and no data corruption seems to have occured, though I deleted the folders that were in the process of being copied and repeated the copy process until it finished without any interruptions. (Should I be worried at all that any of my files may have been damaged?)
In case this matters, I did a clean install of Windows back in early May, and despite having checked for updates frequently, I just yesterday got upgraded to Windows version 2004. I had never heard of this version being avaliable, otherwise I would have downloaded it earlier. Since this OS update, the problem seems to have been fixed, but doing things like opening programs like FireFox while data is being copied will still cause processes to get canceled, but not autodismount anything.
Last edit: Robert J 2020-09-10
Have you check the Windows Event Viewer for errors or notifications when the copy process cancels?
I'll have check that tomorrow. Something to note is that I have two internal drives, and a handful of external ones. The internal ones never had issues when transferring or creating containers/volumes, but the external drives had many issues.
Windows Event Viewer only shows minor notifications from VeraCrypt that do not seem to be related to the errors I encountered. I have no system-favorite volumes, and the Event Viewer's only information suggests that VeraCrypt is sending out notifications every time my system boots up without mounting any favorite volumes.