I helped a friend with a similar intermittent valve problem. He had a Rainbird ESP and it wouldn’t activate the valves some of the time. Come to find out that after a rain or a watering cycle his common wire was shorting out due to moisture in the wire nuts. It would also show the fault light on the ESP. I don’t know but I would think that the Iro has a fault circuit so that if a valve shorts it doesn’t take the Iro out with it. That could cause the reboot of the Iro or other behaviors. Just a few thoughts.
