Thanks for the follow up and providing us with responses from our previous inquiry.
For clarification, does this issue occur when not using the Roku interface for streaming? It looks like you have a Xfinity cable box connected to the Roku TV, when you watch content through the cable box, do you see these lines appear as well?
If so, it would lead us to believe that the issue you are experiencing is related to a hardware issue. In this case, we would recommend contacting the Roku TV manufacturer for further assistance with this issue. Each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS.
For a list of Roku TV manufacturers contact information, visit our Community post here:
Contacting Support for Your Roku TV
Please keep us posted about what you find out and we will be more than happy to continue assisting you.
Roku Community Moderator