Is it possible your back was sore/hurt to begin with? My back was only slightly bothering me when I first got the Z and I noticed after driving the Z and several days after driving it each day it got really bad. It actually got the point I had to go to the doctor for it but I eventually found that the Z was just causing additional pain on my already hurt back. Once my back completely stopped bothering me I never had problems with back pain while driving the Z (or after driving it) after that.
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