Hasn't happened for a while, but happens a lot.  Shares disappear.  Totally.  Like samba just dies.  They are visible from the command line (they show up in 'ls /mnt/user') but they cannot be entered or their contents viewed.  Start/stop array doesn't fix.  Reboot does.

 

Pre-reboot diags attached.

 

ffs2-diagnostics-20230408-1812.zip

Your syslog contains

Apr  8 10:49:10 ffs2  shfs: shfs: ../lib/fuse.c:1450: unlink_node: Assertion `node->nlookup > 1' failed.

which is the process that supports User Shares going wrong.   Quite what can cause that I have no idea but when it happens losing User Shares is a normal symptom.

It's this issue:

 

 

Some workarounds discussed there, mostly disable NFS if not needed or you can change everything to SMB, can also be caused by Tdarr if you use that.

i installed tdarr not 48 hours ago after a friend of mine espoused his amazing success with using it.... but I had it disabled as I was still trying to configure it.

 

And I do use NFS, mostly because I can never get SMB shares to work correctly without hours of troubleshooting.  In all my years using unix, I don't think I've ever had a single entry in /etc/fstab that was consistent in syntax and switches used, lol.  SMB seems like such a huge pain in the ass vs NFS, that I've just used NFS wherever possible.