After the file server was restarted and guardian reloaded, IMC had a hard time relocking because MC2 velocity was kind of big and the fast fringe crossing kept saturating the RFPD DC output after the whitening.

This PD is connected to standard ISC RFPD interface where you have two-stage selectable whitening switch, and both of the whitening were ON. I disabled both and disabled the correcponding digital dewhites (FM2 and 3 in H1:IMC-REFL_DC).

H1:IMC-REFL_DC_SW1R was 1020 before, now it's 60.