As commented by jtholmes attach the following information so that we can help 
you better
~/.xsession-errors
/var/log/Xorg.0.log
Also tell us whether you are using the default drivers or the restricted ones? 
If you are using the latter then have you tried disabling them and reproducing 
the error?
kindly attach your kernel version too by using the command uname -a in the 
terminal and pasting the output here.

** Changed in: ubuntu
       Status: New => Incomplete

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I think X restarts, happens when I watch a video, flash online or stream music
https://bugs.launchpad.net/bugs/163508
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