A few seconds before the lockloss I saw ASC-INP1_P_INMON get pretty large, and ASC-CHARD_P_OUT also started oscillating. I also saw the lockloss in LSC-POP_A_LF_OUT and LSC_PR_GAIN_OUT a few seconds before the lockloss. Pretty sure this is was one of the weird oscillation locklosses like the ones in 82847
This is another one of those new oscillation locklosses. I pulled up a bunch of ndscopes from the front wall and set them all to the same t0 and time range. They look like this: ndscope1.
So a bunch of different channels started seeing a ~ 0.13 Hz oscillation about 15 seconds before the lockloss, and then less han half a second before the lockloss, we see the 10-11Hz oscillation in DARM, the QUADS, and the LSC MICH/PRCL/SRCL channels: ndscope2