Got one stuck in my dell, was very unimpressed that a £550 monitor would let them in, then noticed a few monitors at work had got them, all Dells as well
Looks like a design flaw
Why is everyone acting suprised? We've all heard of computer bugs before, haven't we?
Stop leaving the windows open unless you have a mesh to stop bugs getting in.
Problem solved.
It's not just dells, every summer we get threads about this.