Duet Front Loading Washer banging while spinning

I have had this washer for a bunch of years and still need to get bunch of years out of it. Ever since I got it (bought it used) it has made such a racket when on the spin cycle. seems like the drum is banging on the sides. I have moved 3 times in the past 5 years and have always used the drum moving screws but I think there was already a problem when I bought it used. I always set it back up and made sure the washer was level. I am using a pedestal with it and the feet were adjusted to get it level. What do I need to do to get rid of this noise?