Hi Simon,

I run a small ASUS NUC with an AMD 4700U inside. the time drifts by a few seconds during an 8 hour period!

Maybe the standard frequency of your main power supply is not very stable on 50 Hz. Check, if other machines have this deviation also or not.

Shirley there's a free program on the web i can use to sync with NTP?

I can recommend NetTime, very tiny, run on all Win OS incl. Win 11:
https://www.timesynctool.com/


73, Uwe