Have you tried restarting the device? Settings > System > System restart (Or for Roku TV: Settings > System > Power > System restart)
These things are just little special purpose computers. Like their big brothers sometimes you just need to clear things out by restarting them.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600
I have a 4200x and I’ve done a system restart, unplugged the power unplug the HDMI cord from both the device and the TV ,plugged everything back in. I’ve done everything but a factory reset at this point and still it shows only on half screen - it just started doing it today and I’ve had this device for many years. The software is also up-to-date. HELP!!!
Do you experience the issue on a specific channel or across channels installed on your Roku device? Please also try using a different HDMI cable or try using a different HDMI port to see if that will make any difference. A photo showing the problem would be a great help as well.
Moreover, if the issue only occurs on one channel, removing the channel then re-installing it may help. Make sure to restart the affected Roku player before adding it back in. Visit this Support article for step-by-step instructions: How do I resolve channel playback issues?.
Have you tried connecting your Roku to another TV? If not, try giving it a shot. Please also provide us a photo of what the issue looks like on your TV screen and fill out the following information:
-Roku device model
(these can all be found in Settings > System > About)
-Does this issue occur on a specific channel? If so, what channel and what version/build is the channel (this can be found by selecting the channel on the Home screen and pressing the * button)
-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)
-Steps to reproduce the issue you are seeing
-Screenshot or picture of the issue you are seeing
With more information, we will be able to assist you further.