I googled possible reasons and found that it could be the bake element on the bottom of the oven. When I tried the oven again, I felt no heat coming from the bottom, so I determined that was my problem. First, I placed a thermometer in the oven after setting it to Broil at 500, to make sure it wasn't a problem with the thermostat. Then I found a video on YouTube showing how to replace the element in my exact model of oven. It looked very easy, so I decided to do the repair myself, especially after a local repairman told me he charges $110.00 just to come to my house! I did use a multi-meter as advised to test the bake element to make sure it was definitely burned out(no current was going through). I found the correct part at AppliancePartsPros.com. I purchased the part for about $44.00 and then paid to have it overnighted to me, for a total of $69.00! It worked immediately, and I am so happy I was able to find the necessary help on YouTube, purchase the part I needed, and save probably hundreds of dollars overall!