I always unplug my bernina when I finish sewing for the day. My LQS where I bought it said it was a safety precaution. And seeing that I've lost 2 routers, 3 phones and 2 motherboards you'd think I'd do it for my computer too, but no!! I guess my Bernina is my only prize posession. We do have a lot of thunderstorms here inn the Ozarks!!