Hey @Tri_tam. Have you tried doing a soft reset of your device? You can do this by holding down the setup button for 20 seconds. Once the reset is complete, test another event and check the videos throughout the day time to see if they are still having this flicker.
I'm having the same issue with my Ring Pro. I did a google search and it brought me to this thread. I'm not sure what it is. Maybe its the infared light turning on and off because its happening when its daylight but also kinda dark outside. Hopefully someone can answer this for us.
My front doorbell pro's infrared keeps turning on and off every 10-15 minuites at night, you can hear it turn each of the three infrared lights off one by one, then it turns them on again. Is this a fault? There is ambient light from streetlights, and also passing cars, although it does this when no cars are passing. Is there any way to turn off the infrared? or alter the lux level that triggers them ? I have reset the doorbell with no effect. I have it powered by a plug, and has a constant power supply of 4017mv. I have included a video of it happening, goto around 50 seconds. https://ring.com/share/6799719474914475727