I am having a lot of trouble with my 36" Bertazzoni oven. The side of the oven with the small viewing window (left) on the oven floor burns so hot everything will burn on that side. I have to place all sheets and pans flush right. The flame extends a full inch above oven floor through the viewing window and goes down a bit after a long while. We were advised by Bertazzoni to preheat oven for 45 minutes. This is an excessive amount of time. We are having our 6th service call today to again fix the problem. Has anyone experienced this with their Bertazzonis?