Wife was baking tonite at 400 degrees, rolls were fine and the next minute they were burnt. Turned oven off, and about an hour later I walked by and could see the oven glowing on the top element. Tried to turn off ( appeared to be off according to control ), would not respond. Ended up dropping breaker to shut off and left breaker dropped and went to work. Anybody heard of this before? Is it safe to continue using?, or should I just replace? If I repair, what will be the cost?. Thanksgiving is coming!