I have the same problem through mid-May to mid-June every year. Then it stops (it's stopped, now). Around that time this big fat dumb robin sits on the tree outside my home office window and whacks himself into the window all day, driving my cats crazy. Then he stops in late June. Been going on for at least 3 years now! (I dunno!)

I've tried putting rubber snakes around the pool as scare-crows, to no avail. Then my neighbor's evergreen trees that he planted to create a tight border 16 years ago drop seeds that look like bees into my pool by the million! Now that too is passing.