Busted intercooling radiators are not uncommon and the symptoms match yours. It's not a warranty item but considered "wear and tear" (yet for some reason there is an OEM protection screen available that comes on the A7). It's like $700 to fix if I remember correctly. If that is indeed the case, it's definitely a good time to go ahead and do the APR CPS upgrade as you'll save money if you plan to do it anyways down the road.
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