In the last few weeks my Ring doorbell has been going nuts with false motion detections. I’m paying for the basic plan which is supposed to include “Enable to only get Motion alerts when your device detects humans” but in all the hundreds of videos recorded over the last few weeks there are clearly no humans involved.
Are these motion alerts primarily at night and do you leave a porch light on? If yes, then replace the porch light with a yellow “bug” light that helps reduce the amount of bugs flying around your doorbell.
Also, make sure the doorbell is clean on the front. A damp soft cloth should be able to clean the surface.
Check your settings for motion and see if you can reduce the frequency and/or sensitivity.