Streaming on WiFi I'm getting "Connect to in-home WiFi to watch" message and sound issues.

Hi, I was trying to use Xfinity Stream app to watch live TV on my desktop computer. Whenever I click on some channels, I get this "Connect to in-home WiFi to watch" message. I am at home, and connected to my home WiFi and sometimes ethernet. I belive my modem registered since I am renting it from Comcast.

My second problem is when I switch channels I loose sound and I need to close and restart my browser. This also happens when my computer goes into sleep mode and I wake it up.