first of all I would like to thank the team for coming up with DietPi. It has been a very nice experience with my Raspberry Pi 4 so far due to DietPi

Now to the issue at hand: For whatever reason, a certain kind of load seems to make my SSD go AWOL. I'm using a external case and have had no problems whatsoever, but lately I've been experiencing some weird issues. Writing to the drive via the Raspberry Pi works wonderfully, yet the drive has disappeared on me a couple of times now when accessing it. Mainly via a Windows PC accessing the SSD as a Samba share, but I have seen the same thing happening during an FTP download: The transfer rate drops and I can't access the drive anymore, not even on the Raspberry Pi.
Something I've noticed when this happens is that the DietPi Drive Manager is not showing me the drive's xfs filesystem, but this:


I have never heard of a filesystem called "Net". And it also looks like all the other options for the drive are gone. Does the Raspberry Pi think that my external drive has suddenly become a mounted network share from another computer?
Trying to run "ls" in the mount point's folder gives me an I/O error message.
After restarting the Raspberry Pi, the drive manager shows me this:


As you can see, the other options are back again and I can actually mount the drive without a single issue.
I've tried to find a solution to this problem, but to be honest, I can't even tell what's going on. It has been quite some since I've dealt with linux and while I assume that something causes the connection to the drive to be disrupted, I wouldn't even know where to look for the source of this whole thing.
I'd appreciate if you guys could lend me a hand here.
Cheers
EDIT: I was just able to recreate the issue: Running a ffmpeg command turning f4v files into mp4 while copying all streams, the drive crashed on me again. After restarting, mounting the drive, stopping both nmbd and smbd and running ffmpeg again, I had no issue and all files were successfully created. To me this points straight at the sharing the drive via Samba. Any way I can log what's going on when the crash happens?