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It sounds like the Indivision is coming loose, probably as the Lisa chip warms up. Unfortunately the method of clipping a socket on over chips like that is never 100% as the chips aren't designed to be used like that, so you could have a slight tolerance issue. Are you sure it's seated on the chip properly? Is it slightly raised on one side? There could be a tiny lump of solder or a small component causing the socket to not fit exactly right, or possibly a cracked solder joint that becomes undone because of the heat and pressure.
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