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May be as simple as the cap not being tight, but...
I've heard the cap was re-designed at some point. Maybe yours needs a new cap? They can also be cross-threaded easily.
My Box was doing this too, and the fix was some O rings and some type of flow valve in the coolant tank area. About $150 at the dealer.
The worst possibility is that the coolant tank is cracked. It's a pain to get to and replace. ($$$)
Jack
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