Phone function seems to freeze, the device still works fine but calls will fail to connect and you can't recieve them either. Trying to reboot the phone part by cylcing it in and out of flight mode makes no difference, and just hangs grey once you've selected that option from the menu (the menu you get when you press and hold the power button). The device continues to operate otherwise as normal, so you'd have no inclination this has happened until you try to make the call.
Only solution is to reboot the device entirely.
Interestingly I have also had the above scenario where the call will fail to connect (that is the phone just beeps at you) but trying it again it works fine. This isn't signal related as the signal is not low when this occurs.
Also suffered the same issues mentioned so far, except I'm not sure about the audio dropping in and out, as on the odd occurence I have had this it could possibly of been due to signal. I'm not dismissing it as a possibility though.
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