My WW scale was doing that. I have two places without carpet. It started to weigh quite differently in these two places. Bought new batteries, same problem. I could lose 10 lbs just by moving the scale! I called Conair, they approved sending it back and are sending me a new one. Meanwhile, I have no idea what I weigh and maybe I am better off! This has happened many times in my life with scales. the best are the old fashioned type with weights. Hard to find.