I've placed Gen2 Ring Motion Detectors all around my wrap-around porch, and from sun rise to sunset, they constantly detect motion. I've tried various placements (on the window casing facing outward, under the eave facing back towards the windows, on the porch ceiling, etc.) and nothing helps. Motion. All day.
As a counterpoint, 2 of my 3 Smartthings sensors (new version) do fine. The other is giving false alerts as well. Then, the 1 Ring that is under an eave without a porch is doing fine too.
I can't make sense of it. None of them get direct sunlight. Any suggestions?
shadows from clouds as well as headlights at night can all cause motion sensors to trigger
If you have more than one detector within a given coverage area you can try our zone motion manager and set up a false motion zone, it may help.
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What sensitivity setting do you have them on? If you haven't tried lowering it, you could. May not help, but worth a try.
On the lowest sensitivity my 10lb cats still trigger mine - so not sure how low "low" really is though. 
The Rings are all on their lowest sensitivity unfortunately. I swear the Smartthings sensors didn't do this when on my Smartthings hub, but I'm not positive. Shadows are going to be impossible to avoid. And to think I did this just to have multiple input sources besides my Ring cams for motion alerts!
Sounds like a return-to-seller situation.
The trick that I've found that works most of the time for me is to position the sensor so that the sun is coming from behind it as much as possible. My theory (although probably way off base) is that the light (and resultant heat) will be largely reflecting away from the sensor and therefore isn't as likely to trigger motion with its variation.
