Related to the poor range challenges reported in 86844, there is an extremely high rate of glitches, close to 1 glitch with SNR > 8 every 10 seconds, an increase in rate of 2 orders of magnitude compared to the day before. The first HVeto run of the day shows that H1:IMC-WFS_A_DC_YAW_OUT_DQ is correlated with these glitches at a significance of 850 (10-20 is the usual threshold for an "interesting" significance) and witnesses 70% of all of the glitches in the most recent lock. 

I've attached an example of these glitches in strain data and the mentioned IMC WFS channel, showing that there is a clear visual correlation between them. 

Other channels that are correlated with these glitches are H1:LSC-MCL_IN1_DQ, H1:IMC-DOF_4_P_IN1_DQ, and H1:LSC-POP_A_RF9_I_ERR_DQ (among many other IMC, LSC, ASC, and PSL channels). The full HVeto results can be found here. 

One additional observation is that the rate of these glitches is so high that it is possible they could be subtracted post-facto with standard linear subtraction techniques.