Seems tom me that there is a problem when a users that has been deleted on the LDAP server is sharing files.
The user that was shared these files with will end up having problems accessing his account.
The log shows entries such as ““Message”:“3D038DD0-7F24-40C3-B286-4795A210BFC8 is not a valid user anymore””
I have seen this behaviour quite a few times.
The only solution seems to be to get rid off all LDAP users in Nexctcloud the do no longer exist in LDAP.
Which of course is what should be done anyway.
But a user that does no longer exists in LDAP should not be blocking other users that exist from using Nextcloud.