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Worked fine for awhile again... Started doing it yesterday again. This time, it opened on my way to work, then opened probably 5 times on it's own after I got home. Have a crappy video of it opening with me standing there key in hand. Took it apart to check connections this morning and found corrosion starting on the switch on the tailgate.
There is a recall on the new SuperDuty for this but havent seen anything on the F150 yet or heard of anyone having that issue. On the SuperDuty Ford is replacing the switch and pigtail. Hope this helps some not sure of the root cause but that is what they are doing to remedy.