Crashes out with no error

Hello,
My Fire 10 tablet just crashes Calibre, leaving no error in the log when I use debugging mode.
It ONLY seems to crash when I put the tablet into File Transfer mode (which, of course, is the only way to get books to and from it).

I eventually did a complete uninstall and reinstall and deleted all folders under APPDATA that had 'calibre' in the name.

Now, when I run Calibre, it will stay open for about a minute or so, reading the books folder, I guess, and then it just crashes out again.

--Thanks for the help!
Jim