reason I ask is sometimes the centerforce will loose pressure on a couple of its tabs, and that will cause the plate not to fully dissengage, but havent ever saw it with an oem clutch
I would do this, tomorrow check your fluid, see if its nice and clean or maybe at least golden, if dark colored almost black, have it flushed out and clean fluid replaced, and try that, its a cheap quick check
now if that is not the prob which honestly I do not think it will be, its probably the pads on the shift forks, which usually 2nd third and reverse are the most used and will be the ones that wear the quickest, hence it will need to be taken apart, and have bronze pads installed.