We just started using our Pizza Shelf last week and have really enjoyed the pizza. However, we are having an issue with our oven. Each time we use the Pizza Shelf, the thermal switch in the oven gets tripped. At first we thought that the switch in the upper oven was faulty, so we tried in the lower oven and same thing happened. We were able to reset the switches. Tried cooking pizza again last night, but this time we kept the oven door cracked slightly open. However, the same thing happened.

Any ideas or suggestions?