Well, i dont think its from skype, it was just fine with my old xperia z1. My g4 version is h815tr, which is special for Turkey, and software version is 6.0, v20g-tur-xx
Whats your sowtware version? I hope its got fixed in next update..
I just got this phone two days ago and I've noticed that when I'm in a call on Skype or Hangouts that the incoming audio gets muted every time I speak or when on medium to low volumes. It's become really bothersome because I can't tell whether I'm in call anymore unless the other person speaks...