User Manual Bella 14538 Electric Hot Air Fryer, Healthy No-Oil Deep Frying

It doesn't actually shut off. It's an air fryer so when it reaches the desired temperature the air stops to keep the food from over cooking. When the temperature starts to drop, the air begins again to keep the desired temperature.

Remove the basket and look at the hook. Push your button and see if the hook moves in and out If not contact Bella and they will replace your air fryer free of charge.