replication: sync_client dies

[Sam Smith]

I am able to run "sync_client -u username" for all my users with no 
errors, so there is no problem with the setup or authentication that I 
know of, yet "sync_client -r" fails after a few runs.

imapd.conf:
sync_host: tsnf.gatch.edu
sync_authname: cyrus
sync_log: 1
sync_machineid: 1
sync_repeat_interval: 60

I run "sync_client -l -r" and never get an error - it just dies. On the 
machine running sync_server, I get:

Oct 10 10:13:10 tsnf.gatch.edu syncserver[11089]: [ID 314898 
local6.debug] mydelete: starting txn 2147488126
Oct 10 10:13:10 tsnf.gatch.edu syncserver[11089]: [ID 504160 
local6.debug] mydelete: committing txn 2147488126
Oct 10 10:13:10 tsnf.gatch.edu syncserver[11089]: [ID 873112 
local6.error] IOERROR: reading message:  unexpected end of file

and sync_client has exited on the imap server. It will usually run for a 
few minutes, and then dies with the same message (with a different txn 
number).

Right now I am running a crontab that just restarts it every minute if 
it has died - not an elegant solution.

Any clues?

Thanks,
Sam Smith