I have a piezo electric lighter, and it disables my monitor for a short time, any reason why? Also it only shuts off one of them. I works when I touch it or if I’m 3 feet or so away

I have a piezo electric lighter, and it disables my monitor for a short time, any reason why? Also it only shuts off one of them. I works when I touch it or if I’m 3 feet or so away