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Are you saying it unlatches, or opens all the way up?
Honestly that’s very odd to me. I’ve never herd of this issue happening to LR4s. I’d guess that water got into the electronic latch and is causing it to trigger and open. If it was me just Incase this was the issue I’d pull the fuse to make sure if it is water that it doesn’t damage the electronics in the latch. I’d also check things like the back up camera and the license plate lights to make sure they’re not forged up from moister as well. My guess is you have a sealant crack or a possible crack in the rubber that covers the tailgate button.
Are you saying it unlatches, or opens all the way up?