I came in to lock the IFO for Adam's injections which are scheduled for 2 hours from now, (38380), but have had about 4 BS ISI ST1 CPS trips in the last hour. 

Two of these might have happened while the BS was isolating stage 2 (I have not double checked) but at least one happened while we were just sitting in CHECK_IR (no feedback to the BS sus, ISI state should not have been changing).  The screenshot attached is for that most recent trip in CHECK_IR

Edit:  Made it to a fully locked interferometer and was engagning ASC when it happened again, again it was a glitch in the ST1 H3 CPS.  Second screenshot 

Edit again: This seems very similar to the situation described in 37499, 37522 the third screenshot shows the glitches getting worse over the last 1:40 minutes.  Jim describes power cycling the satlite racks which seemed to make the problem go away last time. 

Another update: I power cycled the 3 top chassis in the CER rack SEI C5, these are labeled BSC ISI interface chassis and have cables going to BSC2 CPSs, GS13s and L4C's.  The ISI has not tripped in about 20 minutes, I am relocking but paused to damp violin modes.