Sounds like the flywheel, mine had the same symptoms. I recall that the price of the fix will depend a bit on whether you have a single or dual mass flywheel. From memory the single mass flywheel can be machined while the dual mass can't and needs to be replaced. Either way, if you're going to open it up down there you might as well sort both out and not worry for another 5 or so years.
Im sure someone else here will be able to tell you more or correct me if i'm wrong.
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