I have multiple imapd-SERVICES configured and experience occasional freezes when I try to log in!
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If you have more than one imapd-service configured in cyrus.conf(5)
then they must have distinct names (the first argument in each line).
Otherwise a deadlock can occur because the services will try to use
the same lockfile, whose filename is derived from the name you gave to
the service.

Certain characters, while not strictly forbidden, should not be used
in these names, because they will cause the name to be truncated. For
example, “imap” and “imap_remote” will result in the same lockfile
("/var/imapd/socket/imap-0.lock"). It is best to only use letters and
digits.
