[Dovecot] DoveCot 1.0a3 hangs at login

[Justin Finkelstein]

I've just upgraded to 1.0a3 via a freebsd port, and I've begun to
notice odd behaviour from Dovecot. After converting my config file
settings over to the new format, everything runs fine for an hour or
so, then dovecot stops responding:

oot at toejamfootball# telnet localhost 143
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
* OK Dovecot ready.
1 login justin at redwiredesign.com password
[dovecot then just stops doing anything]
* BYE Disconnected for inactivity.
Connection closed by foreign host.

in the logs, it says:

Oct 13 09:43:22 toejamfootball dovecot: imap-login: Disconnected:
Inactivity: method=PLAIN, rip=192.168.2.11, lip=192.168.2.43
Oct 13 09:43:22 toejamfootball dovecot: auth(default): client in: AUTH
 1       PLAIN   service=IMAP    lip=192.168.2.43       
rip=192.168.2.11       
resp=AGp1c3RpbkByZWR3aXJlZGVzaWduLmNvLnVrAHBhc3N3b3Jk
Oct 13 09:43:22 toejamfootball dovecot: auth-worker(default):
sql(x,192.168.2.11): query: SELECT username AS user, MD5(clear) AS
password FROM users LEFT JOIN domains ON domains.domain_id =
users.domain_id WHERE domain="x" AND username="x" AND users.enabled =
1 AND domains.enabled = 1 Oct 13 09:43:22 toejamfootball dovecot:
auth(default): pam(justin at x,192.168.2.11): pam_authenticate() failed:
authentication error

Any clues? I don't use pam for auth anyway, so I just ignore that.
When I restart the server and login again it's fine.

j.