I was in the lab, near the south end of the ITMX oplev table, looking for something, and I bumped the POP ASC QPD's power supply. I thought that it was fine, but did not adequately check it. When EricQ asked me just now about why the PRC is so wobbly today, I checked, and the power for the QPD wasn't properly connected (it's kind of a crappy connector, that if you nudge, contacts or loses contact). Anyhow, I restored power to the QPD, and the PRC looks a little more stable now. My fault for not checking more carefully, and my apologies to Q and Gabriele for their frustrations this afternoon.