Hi everyone,
A couple of our SharePoint team sites have been experiencing an unusual phenomenon where user permissions randomly disappear or revert--all seemingly without any user involvement. I have inspected the Security Audit Logs for the past months, scouring permissions activity surrounding these events, but I have not been able to identify any user involvement that could have caused or even contributed to these issues.
One site had a folder whose entire permissions setting became blank. Another site's group ownership reverted to a previous user who moved to a different department several months ago.
We do occasionally restore corrupted Sharepoint items from our DPM backups, but these particular sites and items have not been restored.
I have been reading through several forums and online resources, but I haven't found anything definitive. Any help would be greatly appreciated. Thanks!