Flickering problem

Hi there, hoping this is the right place to ask, but when we’re streaming to the TV from the desktop, the TV repeatedly flickers as if it’s changing inputs. Some movies/shows it never does it at all. Some it does it every few minutes. Any idea what this would be? We’ve changed hdmi cables and changed settingsince etc, but nothing seems to fix it. Even streaming from rogers game center it’s doing it. It is being run off of a windows desktop. Thanks!