Depends upon the wiring.
Some shut down the engine some shut down the PTO
Some shut down the PTO then shut down the engine using the delay module.
In any case, a momentary shut down of the engine usually shuts down the PTO if it is controlled by a relay
A momentary shut down of the engine will not shut down the PTO if it is just the PTO switch.
Thanks for all the advice. It does seem something with the seat being sensitive now that you mention it. Sometimes the blade won't even engage if my son (who is only 12 and is very light) is driving it and it cuts off on him much more frequently.
I'll look over all the wiring this weekend and post back anything I find.