Maybe the wing mirror just need tightning up a bit. Open door and see if you can get off the panel cover. If ok, see if anything needs adjustment.
It could also be something stuck on the outside of the mirror housing. Perhaps it just simply needs a coat of wax (I am not kidding, wax makes it slippery in the wind and may actually help - it did for me a few years ago!).
If still there, bring it to Volvo to have a look at.....
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2019 XC60 T6 R-Design
2017 S6 Avant
1996 850R
1987 780 Bertone
Lots of previous Volvo's 
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