I haven't owned my Audi for long and i am still learning the system but in the previous cars that i have owned i have had a lot of cooling system/ overheating problems and the like.
I noticed that the Audis seem to have a sort of blow off valve on the bottom of the resivoir (sp?) and when it gets hot the hole expands releasing the excess pressure and steam.
Being that the tank is plastic, it's possible that it has expanded too far and it is no longer able to fully contract to normal shape...
You might try replacing the resovoir.
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