Have you done any work on it lately? The last time I installed a new rebound damper in my Sherman, the piston had a real snug fit with the inside of the stanchion and took about a half a ride to seat itself. It felt really sticky with poor rebound. Fortunately it loosened up.
I later replaced the seals with Enduro's and there was a massive amount of stiction. Luckily I bought some Stanchion Lube with them. A couple of applications and it was like there was no break in time whatsoever. Try some of that stuff, you can order it from their website
www.enduroforkseals.com It's super slick stuff and actually penetrates the coating on the stanchions and the seals themselves.
Other than that, no. what are you using to lube the stanchions? Have you checked your semi-bath oil lately?