We have 2 Exchange 2013 servers in a DAG, each server hosts 3 databases. 5 of the 6 databases have copies on both servers, the 6th is a test one which we do not want to replicate.
One of the databases keeps failing over to the other server, it lists it's usual host server as its preferred server and the passive copy as its second choice yet it repeatedly goes into failover while the others remain on their host as they should.
The databases are all pretty close to the same size with the same number of mailboxes.
Does anyone have any idea what could be causing this?