Hello guys, I don't know if someone of you have already experienced this, but I have some strange problems with Skype and Viber. The core of the problem is that Skype and Viber keep ringing for several seconds after the answer. Skype is worst- for the next 15 seconds after picking up, the phone is still ringing even if I close the app. Viber is better (3-4 sec after picking up). The interesting part is that this occurs only if I do answer on Springboard and NEVER on lockscreen. Once I turn off under notification the option "View on Lockscreen" for both apps - everything is in order again, but I loose the advantage of having lockscreen's notifications. What can be the reason of this problem? My phone is 4S, JB and running 5.1.1.