Kenmore microwave fan and interior light stay on, plus turntable goes

We started having a problem with our 6 or possibly 7 year old Kenmore microwave (model # P/N0.:MFL65001001) where the interior light and fan stay on when the door is opened, but everything goes off when the door is closed again. Yesterday the fan and light stayed on every time the door was opened (except once) and turntable still turns too. I just tried it again this morning and it still is acting the same. We are still able to use the microwave to cook thankfully, but the fact that everything is on when the door is opened has me very concerned.