Mine hasn't done that before unless I have done something weird with the inputs. Have you had your fluid changed yet? You're almost to 40k which is the service life anyway, so that may help. When you're leaving a stoplight, are you gradually releasing the brake or just dropping it and pressing the throttle?
You can smooth the transition from rest to moving at a light by easing up off the brake just to the point where you feel the clutch engage (you can literally feel and hear the point where it does by listening to the engine), if you let off any more the car will move, otherwise it'll sit on that point. I of course don't recommend doing that the entire time you're at a light, but if you anticipate the light change, it's a good practice. Not saying that's your issue, but something to think about if you haven't been doing that yet.
How are your mounts, have you don't any hard launches or anything that could've damaged them (especially the dogbone), might be worth having a look at that one specifically to see if there are any cracks or fractures.
I'm at 81k on my '13 GLi and she's not doing that cold or hot. Like I said the only time I ever had that was if I do something weird it wasn't expecting. Also, do you have Hill assist active still, it could just be that kicking in if it's not a clunk and more a dragging of the clutch.
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