Two seperate ovens same problem. After Installation oven was brought up to 350 Deg. Oven light was on. Light started to flicker then goes out. Light switch inop as well. Bulb checked for tightness and operation. When oven door opened up the light flickers for a sec then goes out. This happened same day as delivered. Whirlpool (Amana) says I am the only one with this problem... What a coincidence the replace ment Range did the same thing after Range heated up!