Hi Leezone,
maybe something is wrong with you harddisk filesystem.
Did you try a "scandisk" from Windows ?
As a first solution I would also try to reinstall the operatingsystem.
Ooh, just one idea :
Press "Style Mode" and have a look at the display. Is "PRESET MIX" set to "ON" ? If yes, try "OFF".
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Greetings from East-Frisia ( Northern-Germany )