I started noticing things weren't running as well as they normally were yesterday so i started digging through the syslog and found this:

 

Oct  5 22:04:59 Storage root: CA Docker Autostart Manager Finished
Oct  5 22:05:31 Storage shfs/user: err: shfs_write: write: (28) No space left on device
Oct  5 22:05:31 Storage shfs/user: err: shfs_write: write: (28) No space left on device
Oct  5 22:05:31 Storage shfs/user: err: shfs_write: write: (28) No space left on device
Oct  5 22:05:31 Storage shfs/user: err: shfs_write: write: (28) No space left on device
Oct  5 22:05:31 Storage shfs/user: err: shfs_write: write: (28) No space left on device
Oct  5 22:05:31 Storage shfs/user: err: shfs_write: write: (28) No space left on device
Oct  5 22:05:31 Storage shfs/user: err: shfs_write: write: (28) No space left on device
Oct  5 22:05:31 Storage kernel: loop: Write error at byte offset 7557210112, length 4096.
Oct  5 22:05:31 Storage kernel: blk_update_request: I/O error, dev loop0, sector 14760168
Oct  5 22:05:31 Storage kernel: BTRFS error (device loop0): bdev /dev/loop0 errs: wr 520, rd 0, flush 0, corrupt 0, gen 0

Its all over throughout my syslog so this is just a snippet of it. My cache pool shows that there is 109GB free right now so i dont understand the No space left on device error. Included are my diagnostics.

storage-diagnostics-20171006-0545.zip

You cache pool is not fully used but it's fully allocated, that will result on out of space errors, see here for fixing: