That's odd behaviour. What make and model of television do you have your Roku connected to?
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• LG TV 1 = Model no: 43UH668V | Software: 04.30.70 | OS: webOS 3.31 • LG TV 2 = Model no: 65UH770V | Software: 04.31.10 | webOS •
• All TV's = NOW TV app: 2.27.0 | Post Processing Features: All disabled • Networking Spec = ISP: Virgin Media (75Mbps) | Devices connection type: Wired | IP address type: Fixed (device permitting) •
Tried hdmi cable but still th same
make sure the display settings on your Roku are set to at least 720p. 1080p if the Roku/TV you have supports it.
Also check the display settings on your TV as it's possible something in your TVs display settings could be affecting it. There is often a picture size/picture scaling setting make sure this is set to either "auto wide" or "16:9"
Hope that helps