Bests & Worsts Reviews from Amazon

Return window closed on May 31, 2017 and the oven started malfunctioning June 2. I did not mind that the buttons for the controls wiped off in the first few days. The reviews had prepared me for that. Tonight I set the oven for 425 and pressed start. It read "READY" immediately. I turned it off and tried again several times - even unplugged it, opened the door, waited a few minutes, reset everything and tried again. Still read "READY" immediately and started timer count down. There was no preheating as it had always done until today. I decided to bake the 2 potatoes anyway so I used an oven thermometer to check the temps. Set oven for 425 but thermometer gradually rose to 450. Maybe this oven is just a lemon because I own a lot of products from Cuisinart and have always been very pleased. I purchased the Cuisinart TOB-175 from Amazon Feb 10 2004 and it is still going strong today in our second home. I purchased the TOB -195 April 4 2009 and the fan started making strange noise. Still worked fine but decided that maybe I should replace it with this Cuisinart TOB-260N1. Luckily I still have my old TOB-195 in the basement as I was going to take it to Goodwill on my next trip - glad I hadn't donated it yet - guess I'll start using it again for the time being. I am so disappointed as I was expecting so much better from Cuisinart. Can anyone suggest the best way to handle this now?