Oven randomly shuts off while baking

Costumer says Oven randomly shuts off while baking. I saw it shut off once after shutting it off every couple minutes and then restarting it so I never got to 350 even though that’s what it was said to but it randomly shut off after two minutes of running. I replace the DSI ignition module for the oven but the customer is saying that I did it again where it was getting significantly less warm in the oven in the oven just shut off. Can you guys please provide me with a wiring diagram and your technical input on what else could be regulating the system? I’m thinking that electronic thermostat that I saw there I would appreciate your guys input.