I do have a ticket open, and we're plodding through it, but in the meantime, I was trying to determine when it goes offline. The Logs don't give any indication because they don't indicate any error. The network is up and running without problem, the device just doesn't answer at some point. It still passes traffic on insteon, it doesn't indicate any errors with the lights, and the network port is lit and blinking. Just no answer until I restart it. It's not even DHCP renewal time and there is already a static entry in the table for the device.
ISY 994i zw 5.3.4