I have 2 soundtouch 20 for about 2 months. Every time i try to play both on a group one is disconnected, despite of both being connected to the wifi. Sometimes one cannot be found and other times they are both found but do not work together. The one that works is completely ramdom. They only work again if i set up both (again) using a USB cable from the macbook, not from a mobile phone. I am regreting buying those, for this kind of annoyance i would prefer wired speakers. Any solutions?