Mine do that when driving certain streets with trees on a cloudy day.
If it's sunny, no real problem unless I drive through a densely wooded part of town. It's not a problem mid-day.
But I have noticed it on cloudy days.
Sounds like yours are over the top as far as sensitive, perhaps.
Like already asked- is your dash clear? No papers, sunglasses, etc. floating around up there other than in the little recess in the middle of the dash?