It would be helpful if you included your actual config (occ config:list system output) and installed apps (occ app:list) as was requested in the support template. You didn’t really provide much to go on so at least provide the basics. 
For example, there are tremendous differences when it comes to troubleshooting paths depending whether things like Teamfolders/groupfolders, shared files, etc. are involved.
Any other context too like your underlying storage/filesystem setup/details would be potentially insightful too.
P.S. Do you have audit logs on?