Casting to chromecast disconnects after 4 sec

 It seems like this issue has been going on for quite some time but I am just now finding the issue today so I can  cast to my chromecast for about 4 seconds then it disconnects. I've restarted everything possible that you can imagine I even unplugged my TV nd reset my vizio TV.

 I have uninstalled and reinstalled the xfinity streaming app again it will connect but then it disconnects 4 seconds later. This is only the xfinity app I can cast any other app and it will not disconnect only the xfinity app please advise on what to do?