Started shift in observing mode at 40 W with Michael L. and Evan G. running injections

23:25 UTC nds0 crashed. The IMC_LOCK guardian node went into error thus taking us out of observing mode. The IFO stayed locked. nds0 restarted. Keita and Sheila changed something in the IMC_LOCK guardian code that fixed the error. I set the intent bit back to observing.
01:06 UTC Injections done. Strange moving bump appeared in DARM around 110 Hz. Bump rang done.
01:07 UTC Out of observing to let Jeff K. measure DARM open loop gain.
01:48 UTC Jeff K. done with measurements
01:50 UTC Back to observing
03:56 - 04:30 UTC Stepped out of control room

The IFO has remained in observing mode without issues since the last entry. The only thing to note is approximately seven ETMY saturations. I am leaving the site now.