I’m sorry, as said above, there are many conditions that can raise that error but unbind+reinstall is not a valid solution for all of them.
Absolutely!
I believe it’s always repairable, but how to do it depends on finding the root of the problem.
Yesterday @indra raised a Bug – SOGO (and AD LDAP clients) not working after upgrade - #18 by davidep – for AD. He has a Subscription installation too: did you saw it?