I put the trap out just after sundown. When I collect it the next morning it's full of dead mosquitoes. Works great - for about a month. After that, I put it out at night, and find zero dead mosquitoes, and live ones buzzing around the expended trap. Either our variety of bugs has "learned" to avoid the trap, or the trap has stopped working as designed. The purple light comes on & stays on all night, but it no longer kills the mosquitoes. I bit disappointed, but I can't say for sure the device i...