Hello.

on the Hardware Unit it is 1.2.1[5]

the clock source is internal.

thx!

Hmm okay so thie first thing I would try is to update to the latest software which is 1.2.2[3]. The next thinhg I would check out is to go to change your clock source to ADAT rather than internal so that you are locked in to ADAT even if it drifts slightly.