k1alspll model was sudden dead around 17:40.
This is sufficient reason why GRX and Y cannot be locked, but I haven't checked a time order of these troubles and a direction of causality.

According to a check of web screen captures, it didn't seem to be well known issues such as OS hang-up, a timing glitch, and a Dolphin glitch.
Though I guess that it can be recovered by restarting models on k1als0, it may be better to gather logs and various information before starting recovery work because it may be a problem that we faced in the 1st time.

After then, what we can try is to restart models on k1als0. In this case, the Dolphin treatment isn't required. If it cannot solve this issue, rebooting computer after disabling the Dolphin connection of k1als0 is required. So all SAFE is required. If rebooting computer also doesn't work well, it might be a power down of the power supply unit for IO chassis or a malfunction of IO chassis itself (in the past, the power supply unit had been sudden dead and a capacitor on the baseboard of IO chassis was broken by a degradation over time). In this case, we should enter the mine and check each equipment. If it's related to the power supply around ALS racks, not only DGS-ish but also analogue electronics should be checked.