also posted this questions to Ring subreddit.
Had the Ring 2 for three years and never had this problem.
We're getting a dozen motion notifications a day from our front door camera.
I thought it might be the wind blowing our flag near the front door but this has never been an issue before.
There will even be multiple times where the motion alerts will trigger while there is no motion at all.
I did try setting the alert notification frequency to low but it hasn't helped.
I Have more samples if needed
More recent development is alerts even when the flag is down. no visible motion at all!
I'm having the exact same problem. It seems to have started right after the upgrade that brought up the "Person at your door" feature. I'm literally getting 50 front door motions every night. I do not have this same problem with my Ringe Flood light camera.