I suspect it is now "multi-mass" rather than "dual mass"... and that it is doing a "half-mass job" about now..
With the flywheel cover off, and the wheels chocked so it doesn't roll over you, put it in neutral, then try to move the clutch [back side of dual mass flywheel is bolted to the clutch] and see how much you can rotate the clutch before it comes into hard contact, in both directions..
If you have sloppy free play at the clutch, the springs in the dual mass flywheel are shot and starting to come apart. [what I suspect has happened]
If you can rotate the clutch back and forth by hand [or with a lever, like a screwdriver] the dual mass is failing or failed.. 1/16th to 1/8 turn each way if the springs are collapsed, about...