While baking kenmore elite gas range stopped working also top burners won't ignite. About 20 minutes later everything started working again.

Brand new. 2 days old kenmore elite gas range. While baking cookies during the 2nd batch the oven stopped and we lost all electrical power to stove even top burners would not ignite. About 20 minutes later everything started working again and I reset the clock. 5 minutes later I went to preheat the oven and it lost power again. HELP Please