Why's My Router/Modem Buffering When I Stream Music?

Episode 1766
Joe fromJoe tries to stream Pandora to a wireless speaker, but it breaks up during every other song. His carrier replaced his modem/router with a newer model. While the solution made it better, the problem still persists.
Leo says he doesn't have to use the carrier's modem/router on the network. He can buy his own. Leo says that he can save money that way as well, as it pays for itself. Leo recommends getting a DOCSIS 3.1 modem. Leo's favorite is the Netgear CM1000.