Lockloss @ 03:22 UTC - link to lockloss tool
I originally thought this lockloss was from a M5.4 EQ from Chile that was predicted to hit at this time, but now that the USGS site has updated and looking at how sudden and hard-hitting the lockloss was, I now suspect this was from a M3.2 EQ from Desert Aire, WA, a mere 20 miles northwest of the site.
Since this quake was so close, ground motion calmed down quickly and I've started the relocking process.
H1 back to observing at 04:45 UTC. Fully automated relock after waiting for ground motion to calm.