Not sure how the transfer works, but I had this with my Oneup V2 dropper a few weeks ago at Cwmcarn. I’m a little disappointed as it’s not hugely old and my brand x one that is a few years older just keeps going with no maintenance required at all.
I pushed the post down when I got back, unscrewed the top cap and then actuated the post so it pulled the top plastic bush out of the lower tube. Was muckier than it should be so I cleaned it up plus the area it locates into and greased it with slick honey. Wiped the seal off on the top cap and put some grease on the underside of that too. Screwed it back together and pushed it up and down a few times and now it’s back to full speed (tbh it could launch your nuts into outer space 🚀 now).