Terrible vibrating while quilting and quilt bouncing up and down in APQS Help Posted May 15, 2019 · Report reply Hi Jerry. Can you tell me if the machine is on a slab or on wood floors. If it's on wood floors and upstairs then it could possibly be where you have the machine located upstairs. Even on carpet can cause problems upstairs, depending on where it's located. Houses aren't made the way they used to be made. A friend of mine had this problem years ago upstairs on carpet and it was set so that the machine only had one solid wall and the other three had windows in them. They moved the machine downstairs and it solved the problem. Houses just aren't structured soundly enough upstairs anymore. Lynn.