I have some users that get a time-out in their IOS-app. And I have some that get an empty folder on their Android app. I am not sure whether it is the same reason.
But both can login in the desktop-application and by using a web-browser. And other accounts do work nicely, even on the same devices.
The LDAP Server is a Microsoft Active Directory
I already tried a maintenance:repair and a user:sync.