I replaced the bake element (I thought it was bad but a loose wire that connected the element was the problem--I replaced it anyway), however the oven only comes on intermittently. The broiler element works fine. When I turn on the oven the element begins to glow orange for a while but after about 2 minutes or so it stops heating. It usually never reaches 350 degrees before it shuts off. Strange thing is sometimes it works just fine then at other times it doesn't. Any ideas, thermostat maybe???