Monitor flickering problem

Hi, I'm using i3 2100's IGP. Sometimes when I exit a full screen game, the monitor starts flickering (see attached video). The flickering is stopped by either restarting or going to sleep and awakening. The problem has occurred only 3-4 times in the past two months. I have overclocked the igp to 1.3 GHz via the GPU multiplier, but the processor is perfectly stable and all games run perfectly without and trobul or any high temperature. Please tell the cause of the problem and the solution to it.

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