Or
THIS... Because of the ordinary motions of Opening and Closing the Lift Gate ...and sometimes ...just because ALL Metals and some Plastics WILL "Work Harden" from Repetitive Flexing... each time anything is BENT...the Copper Molecules in the wire HEAT UP and their Crystal Structures inside of the Wires become smaller and smaller AND more and more BRITTLE over time.
These actions continue until they can separate at their weakest sections; even if hidden inside of what otherwise looks like perfectly sound Wire Insulation. In many cases, the mere accumulation of motions of mild work hardening actions happening inside of unrestrained or untethered vibrating harnesses can do this exact same thing.
THESE images display the proof of this reality. And of course... since the LGM - BCM Circuitry is central to the RF (Radio Frequency) Key FOB Door Locking and Unlocking Activity, it reacts to these
*breaks in the wiring* by failing to function properly whenever the FOB Buttons are depressed..