LG System Server stopped working.

Sometimes my D855 is restarting, getting blank screen and no respond or Showing "LG System Server stopped working" and after that happens same as I earlier writed (restarts, black screen). Any help? D855 16GB, Fulmics 4.2, CTT on 2.34ghz and 65 Celsius, Oversharpening on stock value. Also installed AOSP theme for Fulmics (http://ift.tt/1ZvW9bp)

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