Cool, you waited 2.5 million years for a blurry dot.

Been there with a dryer doing the same thing and yeah, cleaning the switch works more often than people think. Those door switches are dumb simple inside, just two metal tabs that touch when you close the door. Lint and dust build up a film on them over the years and the connection gets weak, so the machine thinks the door popped open and kills the cycle. The grease is the real trick though, because cleaning alone will just gum up again in a couple months. A thin coat keeps the lint from sticking and stops the contacts from pitting. The switch only really dies if the plastic housing cracks or a tab snaps off, otherwise it's almost always just dirty.

Ha! I heard a baker on a podcast say basically the same thing, that a bench scraper is the one tool she'd grab if her kitchen caught fire. She said she uses it for scooping up chopped stuff, cutting cold butter into flour, and getting dough off the counter, not just for bread. My mom's old pastry cutter is the same story for me, it cost like five bucks and beats the food processor for biscuits every time.