The rate of these mysterious glitches is correlated with the noise at West End.
I took the omicron triggers of Hrec starting from November 23rd. I filtered them for SNR > 6.5, to avoid the "noise tails", and for center frequency less than 100 Hz. From them, I obtained the time series of the rate per minute. I then did a brute force correlation with all the rms and mean channels (14k) of the trend frame. The results for Pearson correlation coefficient greater than 0.2 are reported in the attached file. I also report some plots of the most correlated channels.