I have the same problem, bought it last year and it has gradually gotten worse, its almost like they made the hole for the gas lift a little larger so it could sit lower but because of this the gas lift is gradually slipping through the hole.
The gas lift on my chair is now touching the floor on carpet or hard flooring and as you can see on the picture the carpet is not plush.
I have opened an RMA but I'm a bit concerned that people are being sent new gas lifts when the issue is clearly to do with the base. :bigeyes: