I found that the HAM2 ISI had been tripped at around 22:00 PDT probably because of me leaning against the HAM2 HEPI peer on the east side.

After I untripped the watchdog, the ISI had a difficulty coming back on its own under the control of the guardian. One time it failed during the X/Y/RZ gain ramping for some reason. I did not look into the detail. Also, in another time, it failed because GS13s saturated during the engagement of Z/RX/RY. Again I did not look into the details and don't know what specific state it was at when failing. Eventually, I decided to go through the process step by step by pausing the guardian at each step. However at this point, it smoothly went and it did not fail. Anyway it is back and running fine now.