I installed an ingound last year with two deep-end deck jets. At the pump, there is a main line that feeds both jets and individual valves to control pressure for the left and right. Recently, when both valves are set the same, the jets of water will be coming out the same height at around 4 ft high and suddenly one will shoot up to 8-10 feet for a second or two and then drop back down to normal. No change in the other jet at all. This cycle repeats itself every 6-8 seconds. Anyone experienced this and know what the solution is? Thanks,

Donald