@TechFan: good news, I was able to reproduce the problem, so I will be working on it right away. This seems a software problem, because it happens even when valves are not connected. Also, I am pretty sure this has to do with watchdog timer, because it doesn’t seem to have this problem with firmware 2.0.6, and the main reason I can think of (that would cause a restart) is firmware 2.0.7 introduced watchdog timer. Will report soon.