dsync-server throwing Resource temporarily available

[Cassidy Larson]

Running 2.2.15 on FreeBSD 10.0 with two back end storage boxes using TCP to
sync.

Seeing a couple of users that always seem to be throwing these kind of
errors in the logs:

dovecot: dsync-server(user at host.com): Error:
write(/var/run/dovecot/replicator-doveadm) failed: Resource temporarily
unavailable

Just wondering what's the proper course of action to fix it?

Thanks.