Motion detection not as good

I’ve had a Ring doorbell 2 for a little over a year now. It was working great up until a week ago, when I started noticing it wasn’t detecting motion events as frequently as before. It used to detect every package delivery, but now it detects maybe 1 in 3. I called Ring support, and they walked me through resetting motion fields and frequency, and it will detect motion right after the changes, but then go back to failing. I'll test it by walking right in front of it, and it won't detect me most of the time. I changed the frequency from “standard” to “frequent” and am hoping that does the trick, but I’m wondering if there’s any reason why it’s not detecting motion as well anymore? Update: After a day of it set to “frequent” motion detection, the Ring failed to detect another package dropoff and me WALKING IN FRONT of the doorbell to get the package. Something is definitely wrong. This seems to be a frequent issue in the forums. Anyone else experiencing this? Anyone had luck getting a replacement unit?