tv pixelation

TV is pixelating - both sound and picture. It's happening on all of my TVs, but it's worse on the one that's hooked up with the router. Internet has also been having issues with dropping the connection, and wifi is no longer accessible throughout my home. We've replaced the router and have the additional pods placed throughout, but continuing to have issues. Can't seem to find a way to connect with a human being to address the issues. How can this be fixed? I work from home and this is directly impacting my ability to do so.