The system freezes every time after I toggle a user and then log-off. After logging off, the display turns black and nothing works to any further extent. This wouldn't be a actual hitch, but dejectedly the system freezes non reproducible from time to time: occasionally during gaming, sometimes during working or watching a video - I can't reproduce it, but the system hangs and the preceding image is frozen on the screen, nothing works anymore. Please help me to fix this problem.
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