The 2 zones which shut down come on strong with good spray for about 15 minutes. They then just shut down. I do not here the water flowing through the valve when the shut down. I have a new controller. I can let it sit for a couple minutes and then reactivate the valve again and I get a good flow again for a few minutes. I checked the voltage which is good at the valve. I have checked for evidence of leaking but can not find any.