Had the same problem not too long ago. Actually when this occurs, the cylinder is bad. The only thing you can do is take it back to where you got it (if it's not that long ago) Our chair was from Staples, they did exchange it. I got the same type of chair cause I loved it, and have NOT had a problem with this one. It's a defective cylinder. I am curious to know which type of chair you do have, as did we have the same type.
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