Go to any supermarket/big box/housewares store and pick up a non-slip shelf liner or similar product (price varies). If you have a Dollar Tree in your area, there is a 5 ft. by 12 in. Non-Slip Shelf Liner available in various colors. UPC # 6 39277 25521 1 (price $1 + any tax). It is the rubbery mesh type. You can cut it to length. That should alleviate the problem. Also wipe off the feet to be sure they are clean of any debris, even dust.