When my computer is connected to internet, and then I open Windows Media Player, it take very high CPU after that: It doesn't happen when open with Music Metro App. And when I stop the "UPnP Device host" service, the problem was gone. But I don't know why it happen, and how to fix it? Close WMP or disconnect internet also fix this but I want to use both. My computer is running Windows 8.1 64bit Internet connect: dial-up connection (Dlink dwm 156 adapter)