So my RokuTV - 8219X, model 43H4030 recently updated to Software version 9.4.0 - build 4190-90 and I use it as a main monitor for my computer. The current issue I am facing is that dynamic lighting is bugged, whenever I'm opening up a new window or browsing the net, the screen keeps dimming and going back to a normal brightness consistently; it's irritating. I have dynamic lighting set to OFF, and it still keeps doing it! I have tried factory resetting it and resetting the video/audio settings, but has worked.
Can you please provide us the following information: -Roku device model -serial number -device ID -software OS/version (these can all be found in Settings > System > About) -tracker ID when this issue occurs (when you see this issue occur, press the Home button 5 times, followed by the Back button 5 times)
With more information we will be able to assist you further.