Re: Wallpaper keeps changing

I recently installed two new Roku sticks.  I also have a new Ultra, but it doesn't exhibit this issue.  The sticks seem to have an issue with the wallpaper changing back to the default every few days. 

I have set the seasonal wallpaper = OFF
I have set the sponsored wallpaper = OFF
I have rebooted the devices several times.
I have manually checked for system/software updates.

Each time I set it back to the default (solid bluish/purple) background, it eventually changes back to the Dynamic theme and, I think, something like the Roku City background.  On my older Rokus (2021 vintage), the Dynamic theme didn't appear.  Even when I select a different theme and customize the wallpaper, it still goes back to the Roku city wallpaper, even though it preserves the sounds from the theme I selected (default sounds).

How can I get these devices to stop changing the wallpaper automatically?