My gas oven keeps turning completely off after about 10 mins?

My gas oven keeps shutting off completely after about 10 mins of cooking. There is nothing wrong with the power supply, but the whole oven completely shuts down. No display, nothing. It will come back on after about 10 mins. WHat is doing it? Also, the ignition spark in the grill above it keeps firing when the grill is off.
Thanks for any advice.