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Dna 250c started to randomly fire


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I finished my dna 250c yesterday.   Worked great most of the day.  Then it started to randomly fire.  Like someone was oushing the button really fast.  Screen would lock then unlock.  Now its not firing at all.  On board button not working, neither is the mtec switch.  I fully disconnected the switch to see if it was at fault and still nothing.  I double checked my solder joints and they all look fine.  Any ideas or suggestions?

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