A4 and Rytm are not in sync

Hey fellas,

First post from my side. I bought an A4 three months ago. Used it with OB and everything worked flawless for me so far.

Yesterday I received the Rytm partner in crime.

So here is my problem. I have both machines connected via USB only. Both OB plug-ins (A4 and Rytm) are set to Sync but in fact they drift quite heavily. What I’m missing here. Any ideas???