I agree with Lee, let the saw run for about five minutes then shut it off for a minute or however long it takes for the blade to come to a complete stop. Then restart the saw.
I also agree with the dealer and would adjust the belt tighter until there is about 1/2"-3/4" deflection in the middle of the belt, do this by moving the rods out.
I would try another new belt, preferably a link belt.
ONLY after the above would I change the centrifugal switch in the motor.
I do not have the Saw Stop contractor Saw, I do have an ICS 5hp.
I did own a Delta Contractor saw bought new in 1988. I had to change both pulleys and install a link belt to get it to calm down. Common enough at the time that you could buy a kit with the two machined steel pulleys and proper length belt.
Good luck
Ron