I have got a S4 yesterday and downloaded my apps and for some reason im having a problem today in that it keeps freezing for about 3 seconds. it does it every few minutes or so and did think it was twitter doing it but its not as does it on other things on the phone. Also on the Wi-fi icon its got the up and down arrows and they are always lit up. so is something working away in the background that is causing the freezing problem and something that is always online? i have shut down any apps that i dont need running but cant work out whats doing its. Any help please.