Today after the maintenance (and also a few days ago) we had a few unlocks while reaching CARM_NULL_1F, but also in steady state once there (but always at the beginning of it). Looking into it I could see an oscillation around 5 Hz with DIFFp_TX having a too high gain.

I reduced it from 1.85 to 1.2 during a lock acquisition and the oscillation did not happen; looking at the trend afterwards the gain changes for some time, but never reaching 1.85 and stabilizing somewhere in the middle. I left it at 1.4 for the following acquisitions.