on several occasions the cameras never picked up someone in my yard at my door yet they pick up every single car that drives by maybe it’s something I’m doing wrong I’ve talked with customer support and they said unistall the app from my phone and that will fix the problem with the cameras not recording motion events sometimes 
does that sound right 
This sounds almost exactly like one of my post. Eufy has a fetish for detecting cars farther than the system is supposed to pick up motion. It even likes tires as faces in their doorbell. I just posted that I used tape to stop the car problem. It may not work for everyone depending on the angle to the road.
I have the exact same issues with my four 2c cameras . I keep hoping that Eufy will address these concerns, but I’ve now resigned myself to the fact that’s not going to happen anytime soon.
So I’m returning mine this weekend.