Ring Spotlight Cam constantly sensing motion

I have had the Ring spotlight battery cam installed for two days looking down on my city-lot backyard area. The motion sensor goes off about every 20 minutes and I’m afraid this will annoy my neighbors and is quickly draining the battery. WIthin view is my A/C unit and my thought is that when the blades spin, it triggers the motion sensor. I tried creating “privacy zones” to blackout the A/C unit and also the shrubs that may move in the wind but it continues to do the same. When I view the recording nothing seems to be moving. Has anyone has this same issue and is the “privacy zones” the best way to fix it or is there another way? Thank you.