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Because internally one of the solders have broken free but don't always make contact. It sounds like you have the exact same problem I had, perhaps you may think it'd be pointless to resolder all of them but it fixed mine. I was told that over 50% of failed CCUs fail in the pins on the side of the CCU, the rest is normally where the buttons are soldered onto the boards and the others are where the side boards meet.
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