So I have noticed recently that my 3 month old stealth reverb seatpost has developed it's own suspension. What I mean by this is when you sit on it, it moves down approximately 2 cm. this happens at any extension. I have checked the pressure and it is 250 psi and today I fully bled the system including the remote lever, but it is still happening. I have raised a support call for this as it should be covered in warranty, but I am sure that I will have to ship it to them, so that's me off my bike a while! Any ideas what this could be?