Exchange DAG getting split?

I had an incident where the DAG was telling me all my servers were offline.  I was not able to mount or move any databases.  I ended up running these commands:

From each DAG member run
net stop clussvc
then cluster (dagname) node /forcecleanup

After the cleanup is complete on each dag member remove the nodes from cluster manager.

After that you need to re-add the servers back to the DAG

Start-DatabaseAvailabilityGroup -identity (dagname) -mailboxserver (servername)

after that the databases should mount and come back online.