Hi. I recently started using the app google duo. It's a video chat similar to hangouts. I can also make it good run on android. But on my iphone(6s), i have the problem that already in a call, the whole iphone freeces. It still speaks but the touchscreen and sensor are geting locked somehow, disabling me from for an example turning speaker on or of or hanging up. And even if the other person hangs up, my phone is still frosen. I have to do a force reboot to fix it. Does anyone know how to fix this problem? I had it on my ipot before but never on the phone.