I bought a new unit and took it back and exchanged it for another one because the a,b,n and enter keys some times quit working. the new exchanged does the same thing. with only these 4 keys. It happens only about once or twice a month but is very frustrating. I went online and found other people had problems with these same exact keys. It is not a spillage problem or use a can of air issue. I didn,t find where anyone found a sollution to this problem. Help meeeeeeee....please

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