Random zones not running

After nearly a year in operation suddenly 4 valves are not picking up Rachio signal. I’ve checked solenoids, tested that the valves function when run manually (as in by my hand, not thru the controller), I’ve swapped wiring locations – I am stumped. They are in 3 separate valve boxes.

@ghbabbitt - Do you have access to an ohm meter to test continuity/resistivity through the zone wire to the common wire? Could be a common wire or connection that went bad. Are these four valves in sequence, like at the end of the wiring? It could be the solenoids, but doubtful that four would fail at the same time.

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