I have had for a few months now, no problem til last night. Grinder wiull start grinding out of the blue. On anf off over and over until I unplug. Ran coffee this AM after thorough cleaning, plugged in, beans ground, then kept geinding on and off, no brew started, beans did grind. After several attempts, was able do disable grind and just brew. Few min. later, started grinding again til unplugged. Grinds a few seconds, stops, then starts again.