Hi Thomas,

Thank you for the pictures, but they lack sufficient contrast and resolution to see the insect's parts well.  This time of year, I assume the problem is indoors.

They appear to be flies, of which there are multiple candidates.  Please review the two linked articles below.  You should be able to distinguish your pest.
https://agrilifeextension.tamu.edu/library/insects/indoor-flies-and-their-control/
https://extension.entm.purdue.edu/publications/E-233/E-233.html

With your firsthand knowledge, I suspect you will be able to identify them.

Thank you for your question.

Thanks for your speedy reply.Hopefully,I will try to send a more detailed image the next time I trap one.

Good morning, this one one of the humpbacked flies, in the family Phoridae.  Here is a factsheet for your reference:  https://extension.psu.edu/phorid-flies

Thanks.
Jen