I found the wiring diagram at www.frigidaire.com
Highlight customer support, click on guides /manuals and input your model #. The diagram covers 27" amd 30" modles, I think yours is 30" based on the mpdel #. You'll see that the only thing common to both ovens is the double line break relay and the controller. I suggest that you check all mthe connector plugs for corrosion, overheating and the like. Otrherwise, the most likely suspecyt is probably the double line break relay. It would be nice if you could test it when the ovens fail. Let us know how you make out. Thanks.