NTP set up in YAST is loosing time

Hi, I have used NTP in previous SUSE 9.X, but on 9.3 I used YAST to set up NTP. YASTs dialog says that it will sync to a time server at bootup. In the past I am sure that the local PC was re-sync'd quite often. I rarely ever saw a difference of more than a second between my "Atomic" wall clock or watch. But now I see the PCs time getting more and more 'off' the longer it has been booted. This is irritating and non-intuitive. The systems should stay in sync with the 'official' time servers. One should NOT have to re-boot just to get the clock back in sync. Is the a way to tell the system to regularly 'sync up'? Has anyone out there found a way to keep a 9.3 system time accurate? PeterB