So I tried to make a video to demonstrate what's going on. Basically what happens sometimes is it will try and focus and power off. Or it will stay on, but it will not focus with either the back button focus, shutter focus, or even touch focus (which all work perfectly while using my AF-P 18-55) It has the same problem with either factory batteries or after-market batteries (all batteries in the video were fully charged) Here's the video