I would investigate why my ext4 disks were not being unmounted cleanly
on shutdown if it were happening here. I suppose my suspicions would
first fall on any network connections.
Yes, i want to investigate it too, but i don't know where to start. SMART of the disks is OK, btw.
I have experimented with different suspect-apps, looks like the culprits are qBitTorrent and Nicotine+ (Soulseek) with access to the problematic partitions.
Btw, when QB is working (not even "active") i have to click on the Restart button always twice. I have it on Gnome, but people say the same problem is on KDE.
So, i want to stress the question - can the failure of a disk unmounting lead to the loss of information?