Lockloss @ 01:50 UTC - no immediately obvious cause, happened quickly with a DCPD saturation.
H1 had reached NLN at 23:52 UTC and resumed with commissioning since L1 was not locked. There were SQZ-related tests being run at this time, but it's very unlikely they were the cause of this lockloss.
Back to observing at 02:54 UTC.