It's very rare to have multiple items fail and then other multiple items fail within a small amount of time that are all unrelated.. Although that does happen , more then likely there is a bigger issue at hand such as the previous post as a bad wire connection somewhere in the field.
Measuring resistance at the controller- documenting and at the valve. A wire tracer and re-doing wire connections would be the start.
Think of it as a shotty car repairs man. The alternater is bad but the guy instead replaces the Battery, Harnest, belt ( For some reason?) , Key ignition switch and then he is confused why it's still happening. If you feel you are in over your league you might want to sub this one out?