Apps constantly disconnecting from the internet I've got a new phone running Android 4.4.2 and whenever I close an app, it disconnects, i.e whenever I close Messenger, it stops being connected to my WiFi so I get no notifications until I open the app, when it reconnects and everything comes through. All apps are doing this, on WiFi and on data.

I can't find anywhere to manage background internet usage and was just wondering if there's a (probably very simple) way to sort it out?
I think your apps are being killed by the System or a  task Killer. I solve the same problem yesterday by Downloading this App: 
Watchdog Task Manager Lite
It will prevent the apps you add into its "whitelist" from being killed.