It happens that a node gets desynchronized from galera cluster:
This article must be executed after this procedure failed to bring the cluster in sync.
To bootstrap a new cluster, see this article.
This article describes the procedure if all the nodes are desynchronized.
This article contains detailed information about Galera boot process and manual override.
It might be a good idea to do a drop and recreate the token table to reduce the size of the DB.
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