Is there a word for the phenomenon of things happening at the same time?

I run a small business, and have noticed that it is definitely not random: things will be quiet for a half hour, then we'll get two phone calls only seconds away from each other, and two customers will walk in the door. This happens every day, several times a day. Admittedly, it gets attention because we go from zero to sixty in an instant, but it truly does happen often enough to be significant. I don’t know if it’s energetic, psychic, collective conscience, or some other event type that I haven’t heard about, but I’d love to know more about it. Any hints?