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2 keys not working on MPK 49

Hi,

I'm using an MPK 49 through a Phonic interface into various sound programs on Mac OS 10.7.5. The problem is 2 keys (E1 and C2) sometimes don't sound and aren't even recognized in the MPK itself. What's weird is sometimes they work fine, and other times they don't - usually after I turn off the power to the keyboard. Sometimes I can get the keys to work after holding them down for a few seconds.

Does anyone know what causes this issue? I purchased the keyboard new and it's been happening since I bought it.
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