Black screen flash when browsing several apps.
On my streaming stick 4k When I am browsing several apps ranging from Prime Video to Peacock and more there is a consistent issue wherein I will move the cursor over with the arrow button on the remote and the screen will go black for several seconds then come back only to do it again when I go to the next one or it may last a few clicks over but it will happen again no matter what. It makes browsing these random apps nearly unbearable.
I have tried updating the roku, checking for app updates and everything and there seems to be no fix for this.
It doesn't seem to me that merely moving from one channel tile to the next should trigger this, but see if this helps any, as it's the only thing I can think of that triggers a black screen of short duration:
Under "Settings > System > Advanced system Settings > Advanced display settings" does your Roku have an "Auto-adjust display refresh rate" item? If so, try disabling it.