I had the problem with my 07; removed the clutch plates, cleaned assembly lube off several of the plates, and soaked the plates in oil overnight - problem solved. It appeared to me the assembly lube that did not get flushed out of several of the plates was preventing oil from reaching the plates which caused them to stick.
Did you do this yourself? Difficulty level? Gaskets required? I'm loathe to take anything to the dealer that I can do myself. Didn't buy it locally and don't want to jump through warranty hoops if my mild sticking gets worse.
Yes, did the work myself. How difficult is subjective... well, not hard at all, kinda fun actually.. You'll need a clutch cover gasket ( $8.00) and a torque wrench, a repair manual ( especially if you've never done this type of work before, be sure to torque per the manual- steel bolts and aluminum threads don't always get along)
What I do to prevent screwing up when I'm doing something I don't do very often:
Get a digital camera
Take a picture of each part before you take it off
Lay out newspaper within arms reach of where you're working
Lay each part you take off on the newspaper, in the same order you took it off
Put the bolts from that part in a container and put the container next to the part
Repeat until you've taken all the stuff off you need to
Take a picture of all the parts on the newspaper which will be in the right order
Put everything back on in the reverse order you took it off
This helps out a lot particulary when thrust washers and such are involved, what seems obvious when you take it off can become a big puzzle when you go to put things back together.........