Guitar Problem (RB3, PS3)

I purchased a guitar for cheap on ebay a while ago and opened it recently, it worked fine for a while, but after a few days the orange and blue buttons trigger at the same time. Has anyone ever had a similar problem? I had a guitar a while ago that triggered the blue whenever I hit select, but never two of the main buttons. Is there an easy fix? Or do I need to take somewhere?
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