"Devices running,press if you want to know more or stop the app"?

[Xanton]

What is this and how do i stop it?

It pops up every time I start Internet. Pressing it will only get me to the appsettings where i can uninstall or stop. If i stop the app, it starts up again after a while. Guess it's someone sharing service, but I have not started anything to share with ex. dlna. 

[Johan]

Hi and welcome to the community! Since you're new please be sure that you have checked out our Discussion guidelines.

Check if you have Media server enabled.

Settings > Xperia connections > Media server.

If not yo probably have a computer on your Wi-Fi network that act as an DLNA server.

Or do this also happen when connected to 3G/4G networks? I can see by your screen shot that you're connected to a Wi-Fi network.