Instability observed today at 14:05, reported to PRC and BKR, including RC: We saw RMS jitter amplitude of up to 4 mm at FXE imager. The jitter was also seen by the upstream XGM with 100 um RMS amplitude. So it is something from the source.

This instability is suddenly appearind/disappearing and was absent over night and started this morning at 7h to occasionally turn on. It appear approx. everz ~30 mins for a few minutes.