Our Kenmore oven is only 5 years old but it doesn't keep the temp. Sometimes it gets to the set temp then goes way down. Other times it never gets to the set temp. It does both of these even though ''heat'' is showing on the display. And other times it's fine. Sears came out but it was working so he didn't do any kind of diagnostic testing. However, a few hours later, it wasn't working again. What could be wrong?
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