Thank you for your post.
Check to see if you have any scripts with the script step: Set Multi-User [ Off ]. This would account for the file reverting to "No users".
Assuming this isn't the case, Recover will try to make the file usable, but it is not a cure-all solution. Since this issue is still occurring with the recovered file, I would recommend using a backup file prior to this issue happening. Import the data from the recovered file into the backup file.