While I was at EY yesterday for h1seiey recovery I took the opportunity to look at the Geist Watchdog 1250 Environment Monitor (env-ey-1) which at the time was not pingable. I verifed that the unit was updating its front panel display (put my finger over the light sensor). I reseated the ethernet cable (no indication of a problem there) and then power cycled the unit. After restarting the EPICS IOC (cds_env_ey.service on cdsioc0) the EPIC channels came back to life.

At 04:30 this morning the unit went offline again (for the third time). The plot certainly suggests this unit's ethernet port goes offline when the room temperature drops into the mid-70s degF. I will schedule a unit replacement.