We've had this oven for almost 7 years now, and recently i noticed that it is not baking my food like it used to. I make a lot of home made bread, and now it does not come out as good any more, the top would not get brown.And it's not just bread, other food too, it seems like it's baking faster at the bottom than the top. The heating element and the broiler do turn red, and this is where the problem starts, I dont know what could be wrong if both heating elements are working.Could it be probe, or maybe a thermostat? Any help would be greatly appriciated!Thank you!