There has been various of flies entering the house (open door) and within hour or so we find them dead on the floor or stunned. Why?

The house isn't infested. Especially since they die so quickly. Though one thing we all noticed is that everybody's (living in the house) health has declined. If that's of any importance. They drop anywhere in the main rooms (Kitchen, living room, dining room; they are all connected) on counters... show more The house isn't infested. Especially since they die so quickly. Though one thing we all noticed is that everybody's (living in the house) health has declined. If that's of any importance. They drop anywhere in the main rooms (Kitchen, living room, dining room; they are all connected) on counters furniture, floors. Our pets seem to be fine and show no irregular habits or issues. What is going on?
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