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If it sounds like marbles in the engine bay, it's most likely the water pump failing

I destroyed the exhaust side wheel of my drivers side K04 due to probable overspin. I'm having them rebuilt and using the 997tt ET wheels, which are slightly bigger than the RS6 wheels from Blouch in the US. Only around 800GBP for that.

OEM Audi has a metal impeller for the water pump, but a lot of the aftermarket kits (especially in the US) have a plastic impeller.

I'm about to get mine back in the next 2 weeks from Blouch, K04 housings with 997tt Extended Tip wheels stuffed in them. So far, they've been great, but they are in the US.