A Ring doorbell isn't going to work reliably without having two three essentials --
1) a good connection to the local wireless network
2) a good internet connection with sufficient upload speed
3) being a hard-wired Pro model
#1 can be a challenge, even if the router is sitting a few feet away, because its wi-fi hardware is less than great.
#2 is vital, because they have no local storage and have to connect and upload the video to the servers
#3 the hard-wired Pro models can be challenging, even under good conditions that the cheaper battery-powered models may struggle more with.
#3a the hard-wired models require a sufficient electrical supply from the doorbell transformer, which often needs to be upgraded
Motion detection is also reliant on it being properly installed so the sensors are seeing the right areas, and the motion zones are set properly. There are pictorial help guides that show how they should be installed and aimed. I don't know how the current models' features are segmented, but in the past, only the Pro had customizable zones, which was a big advantage to getting accurate triggers and avoiding false positives.
And though less frequent, the servers sometimes have issues, and the app has bugs, which can prevent notifications from being made even if motion events are captured.
Thankfully, my experience with a Pro has been good, but these things are very much a YMMV product, regardless of brand, since there are so many variables. There is no shortage of complaints in the Ring forums and subreddit.