Could be a nest in the walls and they are finding their way in to the house
side via a crack or opening around a window frame or door frame. On the
outside, look for any openings in the siding or gaps around trim, etc. You
may see then entering or leaving a nest. Once found, insecticides will
usually do the trick. Random spraying around all joints may or may not
Those suckers hurt too when they hit you.
You are going to have to catch them in th act. They are so small they
can come from anywhere.
I have had them come in from the attic through my ceiling fans. They
usually will go back and forth to where they come in and out of so if
you can stand it dont kill them right off just watch them.
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