I have hardware 1.4u and firmware 1.8.3. OP works ok when I uncheck sequential (never crashes). When I check sequential, the controller crashes when 2 valves are open at the same time. This happens intermittently. The crash is not when the valves open or close but during a 15 minute irrigation period. Does a MOV fix this? I don’t know what a MOV is. Do I need to modify my board to be like 1.42u to eliminate the crashing (screen goes blank, no access to OP via chrome and a reboot restores normal function.)