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That's a head scratcher. I haven't heard a problem similar to yours described here before. and, believe me, if there is any reoccuring problem with the 300, we know about it here on this board.
The 300 cabin is very well sealed and normally very quiet at high speeds. The exterior design seems to not produce any loud wind noises. that means something is wrong. I suspect you have an air leak around the windshield somewhere that is forcing air through a tiny fissure (thus the whistle) from outside into the cabin at high speed in hot air.
The heat may be causing something to expand, causing the opening. Moving the wipers seems to disturb the airflow and stop the whistle.
I would try the dealership first and point them towards a possible leak in the windshield seal. That should be covered under warranty.
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[“Life is not measured by the number of breaths we take,
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but by the moments that take our breath away”
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