I have not had any trouble with temp sensor. In fact my hub never really gets warm. There may be trouble if you are a west coaster and overdrive your hub at full throttle. Your 500 should be handling that 36v with no problem.
Ive had my 750Hx for 3 years now. unbelieveably the 36v battery is still going strong. I do see voltage sag earlier however.
i am starting a thread to hopefully understand batteries better.
I am upgrading and the available voltages are tempting. You can see how with a 52v offering a person can...