I've got a similar issue and is definitely related to the proximity sensor: when the telephone app is down but there's a call active and I want to tap the green stripe to go back to the call the screen starts to blink and the phone ceased to respond until it perform a "fake reboot" (no pin needed). It happens almost every time I put the phone near my cheek ant next try to change the audio mode.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1532607 Title: Phone not usable while a call comes in - followed by "restart" To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1532607/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs