Last night, we turned on the convection bake and smelled a horrible electrical burning smell. The oven elements worked fine on bake. We can still use the smooth cooktop burners too. We just now tried to broil and the element will barely heat...left it on for 15 minutes and only got to around 150 degrees using thermometer inside with door closed. Tried the convection again and got the same smell. Reset the power breaker and checked the plug...still having the problem. We now have it on bake and it's working fine. Any ideas?