(SLE) 8 and rsync issues

Apologies if this has been discussed before but I have only just subscribed. Problem : Run half hourly ryncs (Version 2.5.5) from one SLES8 host to another. Unfortunately about one out of every ten ryncs fail immediately with the following :-

rsync error: partial transfer (code 23) at main.c(578) rsync of directory lonshsfappb1.uk.db.com:/data failed

There are no sym links in the /data file system and network connectivity between the two nodes has not been problematic. I've trawled through the internet and have not found anything specific that I can go on. Any help would be greatly appreciated. Thanks, Mark Needham