I bought this oven in March 2017 thinking it was the countertop oven for my retired years, after having Oster, Black and Decker that lasted for years, because I am very careful with all my appliances.  The Oven/Broil/Warm function stopped working. It’s me and my husband at home and we don’t use it every day. A couple of mi this ago a weird sound appeared and then disappeared. Model KCO233CCU
Serial WF42103405.
We decided to pay for it because it looks nice and sturdy and the brand has very good reviews.  Worst choice of my life... I can’t use it anymore and can’t afford one right now.