I have a GE Truetemp double oven - Mod JKP45BA2BB. Used the self cleaning on the bottom. Set it for 3 hours. After 3 hours, oven was no longer hot and it didn't clean. Now, the bottom oven no longer heats up. Top oven works (I did not use the self cleaning on the top). Second time this has happened when using the self-cleaning function. First time I had it serviced and I believe the control board was replaced. This happened about 3 years ago. Suggestions?