Toro 75750 Zero Turn

I have an issue where the mower shuts down intermittently when I am mowing the lawn. If I dis Engage the PTO switch to the deck quickly, the engine does not die but when I re engage the PTO, it may shut off or run for a bit until you go thru the same process. The seat interlock seems fine and even does well when it when jumped. Do I most likely have a flaky PTO switch? I have cleaned contacts etc. Or could the brake actuator module be an issue killing the Magnito lead? Not sure if the PTO switch can kill the engine.Thanks