You are not alone. I have a Roku smart soundbar & it does this. Am also using Roku Rain screensaver & HBO Max is what I'm watching now which prompted me to search for cause/solution...
Can actually be creepy at night when watching a scary movie paused & then come back to what is almost like a strobe all over the room with a scary image on the TV and the screensaver rapidly flickering over/through it...
Hi @rusself
Thanks for posting in the Roku Community regarding the issue you are experiencing with your flickering screensaver.
If you change the screensaver that is not the Roku Rain, do you still experience the same issue with the flickering on screen?
Please keep us posted what you find out and we will be more than happy to continue assisting you. We look forward to hearing back your response.
Thanks,
Danny