I've had my roku for years, and i've always had this issue.
Far as I can tell, its related to the HDMI in some way. Every single port behaves like this.
Now, onto the issue. Whenever I use my roku tv with HDMI connected to any of my computers, the display will go black for several seconds when say, fullscreening a application with youtube on it's screen. The TV's smart ui is working just fine seemingly, but I've not been able to find a single setting to fix this EXCEPT for, if I recall correctly, turning off hardware acceleration on the application i fullscreen, which is frankly a unacceptable trade off.
So now I'm trying to ask if anybody might know another solution. I've tried to comb these forums over youtube for any supposed fixes and none of them have settings I have or they're not actually fixes.
Heres the TV information.
Model: 8113X - Roku TV
Serial Number: YK001N092875 (JAA081092875)
Software Version: 13.1.4 build 1510-48
GC Version: 12.2.22
Timestamp 2024-10-02t11:39:17Z
And the issue ID it says to use is 75-396-699