The OMC would not lock as we entered DC_READOUT_TRANSITION, and the DARM spectrum had risen around 100Hz. Sheila tracked it down to H1:LSC-ARM_INPUT_MTRX_RAMPING_1_3 having a gain of 20 and not 8. She investigated further and realized that the matrix was not being loaded beore the actual value was in place, something that a sleep of 0.1s can cure. With her help. I added in these short sleeps or just loaded later.