Using Spectrum (cable) with an AIO cable modem/router: SurfBoard (old Motorola) SBG-6900-AC. NO connectivity issues using YouTube, Hulu, Roku, etc, using wireless AND wired. But using Sling on PC or Roku all kinds of Sling error messages on any channel (login fine). According to Sling I should use another network? Anyone have inside info on what's going?