Samsung Oven Runaway Temperature

Brand: Samsung
Model Number: NE58H9970WS
Main Symptom: Oven Overtemp
What happens & when: Intermittently the oven will be set to a temperature, reach that temperature, signal it has reached it, and then keep going. Replaced the temperature sensor but issue persists. Last test the oven reached over 650 degrees before I turned it off. Looking to see if I can replace parts on the control board as opposed to having to change the entire thing.

Error Code (if any): None have ever shown
Parts or tests already tried: Changed Temperature Sensor (DG32-00004C) I think this was the right one?**
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