Catch it in the act
Note the hour, the station, and the weather. A zone that only fails after 3 p.m. may be a heat-soaked solenoid. A system that skips a day may be a sensor or an odd-even program fighting a second start time.
We want the pattern
Call 346-642-6161 and give the pattern, not only “it acts up.” The pattern picks the part. If you can leave the system on the failing station when we arrive, the diagnosis is shorter.