Hey - NavyVet1959... I have (had) the same problem you described for a runaway tumbler. I cured that with a small square of carpet with the rubber backing on it. Take a carpet piece large enough to fit completely under the base of the tumbler plus a few inches for insurance, but not so large that it gets in your way when walking around it. Place the tumbler on it and it will stand in place until you shut it off. Enjoy.