Xfinity TV having problems

Still tells me Im not on my home network when I am. Ive had this problem since the March update. It had worked fine for over a year before that. A few weeks ago I worked with Comcast support. The last person I talked to at Level 4 Support told me that since I own my modem instead of renting theirs its my problem and not theirs. Thanks Comcast

EugeneU about Xfinity Stream, v3.5.0