I'm just about to send my Fox Float R shock from my Anthem X away under warranty for the second time.

After about 6 months and around 5000km the shock loses rebound control. Clicks 1-8 from fast to slow are not noticeable from full fast (ie click 1) and then click 9 is so slow that the shock doesn't extend properly. So you're left with either too fast a rebound or too slow a rebound.

Air can is properly serviced, shock holds air properly, shock does not leak or loose oil, no physical damage etc, so its definitely something going amiss inside the damper.

Anyone knows what causes this? The next time it happens the warranty will probably be up so I'll need to make sure I can fix this myself.