It happens really often to me, and I see:

compiz[2686]: segfault at 10 ip 00007f1d60b08a23 sp 00007fff50cfa560
error 4 in libgdk-3.so.0.200.0[7f1d60acb000+77000]

in kern.log


Jan 17 19:55:58 luna gnome-session[2603]: Gdk-WARNING: The program 
'gnome-session' received an X Window System error.#012This probably reflects a 
bug in the program.#012The error was 'XI_BadDevice (invalid Device 
parameter)'.#012  (Details: serial 529 error_code 149 request_code 141 
minor_code 48)#012  (Note to programmers: normally, X errors are reported 
asynchronously;#012   that is, you will receive the error a while after causing 
it.#012   To debug your program, run it with the --sync command line#012   
option to change this behavior. You can then get a meaningful#012   backtrace 
from your debugger if you break on the gdk_x_error() function.)#012
Jan 17 19:55:58 luna kernel: [49057.361005] compiz[2686]: segfault at 10 ip 
00007f1d60b08a23 sp 00007fff50cfa560 error 4 in 
libgdk-3.so.0.200.0[7f1d60acb000+77000]

in syslog

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https://bugs.launchpad.net/bugs/900308

Title:
  Unity crashes after being suspended for >48hrs

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