Hangs up for periodically

Since some recent update, it hangs up for about 15 seconds, when I open Skype by clicking pop up notification. Often hangs up when I open Skype and click a user: the chan window opens and the app does not show a sign of life for while, then starts processing all the gestures I made while it was hanging.

Is123738 about Skype for iPhone, v6.34.1