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by (Genius) (10.4m points)
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Hi. The last time I dealt with an AG Mobile device (AG Sting particularly) with this kind of an issue, I found out that dust had built up between the button contacts and the metal connector plate under the keypad membrane. Try and open the covers, peal of part of the membrane covering buttons 3,6 & 9 and clean both the contacts and all three metal plates using a tooth brush. This normally can be caused by water having somehow gained entry thereto and sometimes can be a permanent damage.

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