I also noticed a few things after the crash,

- the first being the proximity sensor which now behaves like the phone
is in a call and blanks the screen when your hands reach the top of the
phone during normal usage.

- Second being the call which is dropped is not recorded/listed in the
dialer app. I suppose this could be because dialer-app only adds call to
the history list after it is ended.

The crash triggers seems rather random. I have had it crash with just
one app running and also with several apps running. Can't find a
reliable way to reproduce it :/ Hopefully the unity-system-
compositor.log provided by pat should help. I will upload mine as well
in the next comment.

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https://bugs.launchpad.net/bugs/1532607

Title:
  Phone not usable while a call comes in - followed by "restart"

Status in Canonical System Image:
  Confirmed
Status in Mir:
  New
Status in mir package in Ubuntu:
  Confirmed
Status in unity-system-compositor package in Ubuntu:
  Confirmed

Bug description:
  My system:

  current build number: 225
  device name: krillin
  channel: ubuntu-touch/rc-proposed/bq-aquaris.en
  last update: 2016-01-09 06:52:53
  version version: 225
  version ubuntu: 20160109
  version device: 20151216-378d4f3
  version custom: 20151111--36-46-vivid

  What happened:
  Someone called me and I wanted to take the call on the phone (nothing 
attached to the phone). The screen was locked and I pressed the power button to 
unlock the screen. The phone did not react on any pushed buttons. The phone 
continued ringing but I was not able to do anything with the phone during this 
time.

  During the next minute the phone was blocked. After this period a
  "restart" followed.

  "Restart":
  The restart was not a real reset. The phone screen was black. Then approx. 1 
- 2 minutes after the call was gone, the screen went on again and the ubuntu 
logo with the dots appeared (same screen when you start the phone but without 
the "bq"-screen). 

  I did not need to enter the PIN code of the SIM card. The phone was
  again fully operational.

  This happened on January, 10th at approx. 13:30 h. I have attached the
  sys.log for your review and hopefully for tracing back the issue to
  the root cause.

  Matthias

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