I set the oven to preheat and it will work for a short time. Sometimes only a minute or two, sometimes up to 45 minutes. When it stops, the clock goes out and none of the range top ignitors work. After a different amount of time each time this happens, the powers comes back on and the clock will flash. If I press the cancel button the clock stays on and I can begin the cycle again. I am guesssing that it is the control panel, but want to be certain before I drop $150.