A visual inspection of the pins and socket will generally tell you if corrosion is the issue. I don't believe that's your problem—since it works intermittently, without your wiggling the wires.
It could be internal corrosion or a bad IC chip. My bet is that there was a flaky chip that had a thermal fault and as you used it, the heat from use caused it to become progressively worse, until it has basically failed completely.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.