I have a Whirlpool Super Capacity 465 Accubake System range/oven. The burners work fine, but when I use the oven, it will usually preheat and stay hot from anywhere from 1/2 an hour or even longer, but usually stops heating without being turned off. The broiler works fine and I'm not sure about the self-clean feature. I don't think it's kicking on, although the panel lights all say everything is working. I wonder if this is worth fixing, or would I be better off buying a new appliance? Thanks to all who respond.