There's been a very noticeable excess of jitter in DARM, esp the broad peak ~120 Hz. (pointed out by many, incl. today 70206). The 120 Hz broad noise peak (+some extra lines and noise in that band), seem to clearly be jitter.

Gabriele and Andrew L. have seen the peaks show up as early as May 24, and starring clearly in every lock since 5/27. Could this be related to ISCT1 on-table alignments the week of 5/24-5/27? That's something I've seen in alogs from that time period. If so, is there an alignment that recovers the previous scenario, when this jitter was better? Some events that week:
1) ISCT1 alignments done Tuesday 5/24 (69897), the 120 Hz then briefly appears (are we sure it was not in any locks before ISCT1 work?),
2) then there weren't many locks for the week,
3) the HAM ISI issues were resolved briefly starting Friday 5/26 (69934) with on-table alignment re-done one last time ~5/26 23:30 UTC (69960),
4) the 120 Hz jitter is visible in locks ever since

Andrew Lundgren sees that this 120 Hz is coherent with jitter witnesses, H1:IMC-WFS_A_DC_PIT/YAW, and that there's both more coupling and more jitter. Jenne's cleaning 70054 sees this jitter clearly, but it is not cleaning totally all of it away.