If the thermocouple is malfunctioning or not sensing the flame properly, it could cause the oven to shut off. Check the thermocouple for any damage or misalignment. If it's faulty, it may need to be replaced.

Another possibility is malfunctioning control board. It is responsible for managing the various functions of the oven, including the gas valve and igniter. If the control board is defective, it may be causing the oven to shut off unexpectedly.

You can seek help from professionals as well.