My mobile network connection turns off automatically when i press the sleep/wake button. When i press it again to wake my phone up there is no service. I need to go back to settings, mobile networks, search networks and register my network again. Ut might might something to do with my ROM but i'm not sure. Running: I9505_-_Official_Google_Edition_4.4.2_by_Jamal2367_Final-R4 ROM, Samsung Galaxy S4 i337m, Telcel in Mexico.