Getting back to the initial inquiry, one thing I don't see mentioned is the wire leads can harder or otherwise deteriorate over time and this could cause them to become less flexible. Additionally, a PO could have found the disintegrated wiring and performed a repair with incorrect wire not designed to stand up to the flexing and/or could have applied solder such that it had flowed further up the wire than expected again reducing flexibility. Ensuring superflex wire (sometimes listed as SW-22 and SW-24) is utilized and properly soldered will likely alleviate all but the more extreme cases.
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