Thanks for the logs. /var/log/syslog, /home/phablet/.cache/upstart and
/var/crash are usually good place to start gathering information.

>From syslog lightdm restarted 
Jan 10 13:31:17 ubuntu-phablet kernel: [62846.465084]init: lightdm main process 
(1966) terminated with status 1
Jan 10 13:31:17 ubuntu-phablet kernel: [62846.465143]init: lightdm main process 
ended, respawning


Which could be due to mir stopping according to this error unity.log.3.gz 
[1452429068.600713] <ERROR> mircommon: Caught exception at Mir/EGL driver 
boundary (in queueBuffer): 
/build/mir-4B0JBP/mir-0.18.0+15.04.20151216.1/src/client/buffer_stream.cpp(169):
 Throw in function virtual MirWaitHandle* 
{anonymous}::ExchangeSemantics::submit(const std::function<void()>&, 
mir::geometry::Size, MirPixelFormat, int)
Dynamic exception type: 
N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: disconnected: no new buffers

[1452429068.629109] <ERROR> mircommon: Caught exception at Mir/EGL driver 
boundary (in queueBuffer): 
/build/mir-4B0JBP/mir-0.18.0+15.04.20151216.1/src/client/buffer_stream.cpp(169):
 Throw in function virtual MirWaitHandle* 
{anonymous}::ExchangeSemantics::submit(const std::function<void()>&, 
mir::geometry::Size, MirPixelFormat, int)
Dynamic exception type: 
N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: disconnected: no new buffers

[1452429068.662103] <ERROR> mircommon: Caught exception at Mir/EGL driver 
boundary (in queueBuffer): 
/build/mir-4B0JBP/mir-0.18.0+15.04.20151216.1/src/client/buffer_stream.cpp(169):
 Throw in function virtual MirWaitHandle* 
{anonymous}::ExchangeSemantics::submit(const std::function<void()>&, 
mir::geometry::Size, MirPixelFormat, int)
Dynamic exception type: 
N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: disconnected: no new buffers

qtmir.mir: SessionListener::stopping - this= SessionListener(0xb191eed4) 
session= 0xae201d54
[1452429068.693550] <ERROR> mircommon: Caught exception at Mir/EGL driver 
boundary (in queueBuffer): 
/build/mir-4B0JBP/mir-0.18.0+15.04.20151216.1/src/client/buffer_stream.cpp(169):
 Throw in function virtual MirWaitHandle* 
{anonymous}::ExchangeSemantics::submit(const std::function<void()>&, 
mir::geometry::Size, MirPixelFormat, int)
Dynamic exception type: 
N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
std::exception::what: disconnected: no new buffers

Signal caught by Mir, stopping Mir server..

@Uranicus, is there any crash file from the date of the incident in
/var/crash?

Thanks.

** Also affects: qtmir (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: canonical-devices-system-image
   Importance: Undecided => High

** Changed in: canonical-devices-system-image
     Assignee: (unassigned) => kevin gunn (kgunn72)

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

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