I’ve a 2 year old reverb, was serviced a few months ago and covered around 100 miles since (I don’t get out much) recently its started to stick. When I press the lever with my Weight on it fails to drop, I have to bounce abit before it will drop, it will come back up fine and will continue to drop fine if I tried it again straight away bur a few mins later it will stick again. I done the basics, bleed System, clamp not to tight, 250psi, clean and tube shaft, its to me got some stiction, if coming back up slowly it will make a sticky seal noise but I’ve had this on previous reverb which have worked fine.