Brand new Supermax 16-32. Following set up instructions exactly, get a slight vibration with sandpaper on, barely detectable with no paper on the drum. Reloaded the paper multiple times, same vibration. Tried a new roll of paper (the precut ordered at same time), same vibration. Again, it's slight, but enough to vibrate a piece of wood of the top as its running. No, there is no dust jammed up in the drum. Moved to different parts of shop thinking uneven floor. Nope. Put it on a rubber mat. Nope. Put anti-vibration feet thingies under it. Nope. Same vibration. Yes the paper is loaded correctly. Also, just running with nothing sanding, the motor casing heats up pretty good. Not too hot to touch, but enough to melt butter eventually (no I didn't melt butter!). Waiting to hear back from tech support (which is also a concern), never had a DS before, did I get a lemon? With no paper, I'd classify the vibration as driving with really cheap tires at high speed. You sorta notice it, but it seems normal so you floor it. With the paper on, same cheap tires, but you're like "That doesn't seem right" and your knee jerk reaction is a tire is out of round.