Hello Exchange 2013 CU7 on premise, and a Public folder serving the purpose of distributing a large number of contacts to users. There is a security group with 'Publishing editor' permission level on this Public folder and two Owners. There also has been a recent move of the PF mailbox to another database - if that is of any importance. Last but not least the access to the PF is through RPC over HTTP.
Now the 'Editor users' trying to access the Public Folder and edit existing contacts after some time they get an error message that he has not sufficient permissions or the folder has been moved. If he cancels the edit and retry he is able to to complete one or two edits then again the same message appears. This is really annoying to 'editors' and frustrating to us trying to troubleshoot and provide a solution. ;-)
Any ideas are welcome.