Hello,
I have a such problem. Approximatly in 10 min after starting sleeping mode my phone can not receive incoming calls from Skype and Viber. There is no problem in a few min after sleeping mode or when a screen is on. I have this problem whenever wi-fi or 3 G connection is. When the screen is on after that I receive messages about missing calls. Swithing stamina off, reinstalling of phone's soft doesn't help. Wi-fi is always on in settings, mobile transfer is on too. Help me, please.
