[Closed] Fox RP2 shock seems to have lost it's damping...?

Rode my Zesty last night around Ashton Court/Leigh Woods and whilst getting ready for the ride, I noticed that my damping seems to have lessened on my rear shock.

I run quite a bit of damping and so noticed the quicker return. I tried to wind on a notch or two and found I only had one click and I was at the max.

Is it the case that the damping can slowly go? Could the weather we've been having potentially cause this with all the mud etc?

Short of a service and custom tune from Simon at LoCo, is there anything I can do myself at home to service the shock in order to get the damping again?