hey guys just jumping into to say my 09 wrx has this problem but it didnt start till about 2 weeks or maybe even a week after my new clutch an flywheel. So if your planning to get a new clutch or flywheel due to this problem. Your problem will NOT be solved at least i dont believe so. Also the tech at subie also told me it was my throw out bearing but idk. Anyways it comes and goes and really only last about 5-10 min im guessing its not a big problem thats just my two cents.
Oh and i saw some post that a new tranny mount could solve the problem so im getting one at the end of the month to confirm ill keep you guys posted