Funny I'm literally having the same problem. I could have sworn I posted this myself. I've been having problems for a couple days. It's because they have a nest in the outside wall of the house that we sealed off and they are now all trying to get to it anyway they can. I have no idea how they are getting inside tho.
My remedy has been a home made wasp trap out of a 2L pop bottle, my "wasp whip" (black tea towel), and extreme vigilance.
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