I had my Bernina 440 at a quilt retreat out in the country, right after I got back home it stopped working. My dealer said it was do to a low power going to it, and damaged the motherboard. It was still under warranty at the time. From then on, I have all of my computerized sewing machines plugged into a battery pack surge protecter, that you can pick up at Best Buy for about 40 bucks. I warned my guild about it, but the same thing happened to another quilter at another quilt retreat with her machine.