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thanks for your response , as for the exact description of the problem :
when the famous and troublesome zZz sign appears , sometimes the three keys under the screen does not work , sometimes the center one works but arrow keys don't.
sometimes when i try to push the buttons fast , the arrow keys at the edges of screen , stay lit , and does not accept orders.and eventually , there are times that for no reason at all , a set of keys stop to function for a minute or two.
cheers
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