Can you check the wire connections you did at the patio? Did you use water proof wire connectors?
Basically you have a bad wire connection / nicked wire in the field somewhere between the valve and the controller.
As a tech my next step would be to wire trace the line out from the controller and back from the valve. If needed I would then use my fault locator to find the leaked voltage and then repair the nick/bad connection
It may be best to get an irrigation company in?
Are there any spare wires to swap to? Would it be easy to run new wire? If there is a another valve nearby you can use a splittler/
Add-a-zone