It wouldn't surprise me in the slightest. The materials used are absolute junk.
I have a Rubicon and had the fresh water tanks fall out while driving. Fortunately, they didn't quite hit the ground. Had it 'repaired' under warranty with a quote from the dealer "they are solid now, you won't have any more problems!"...until two weeks later when they fell out again and I discovered that the warranty 'repair' used the same supports and just added another bolt.
The problem is that Lippert make a frame that is used in lots of different applications so one side of each tank support - each water tank plus the black and grey tanks - has a solid, welded support and the other side is hurridly constructed from some thin galvanised angle, cut to length and then with a piece bent outwards at each end and screwed into place with a self-drilling bolt. The weight of the tank plus contents causes the bent part to rotate, tipping the angle downwards and allowing the tank to drop off the support.
I figured that there was only one way to fix it properly and that was to do it myself. I removed all the bottom cover (nailed into place so pull those out with grips, drill out each hole to maybe 1/8" and replace with small, self-drilling bolts when you replace it), supported the tank one at a time, removed the old 'support', measured up the gap and had new angle-iron supports fabricated that I then bolted into place using effective nuts and bolts.
Now I *know* that they are not dropping out. While I was under there I also tidied up the appalling wiring and ducted my warm furnace air to the locations it needed to be to keep the void from freezing. It's also a good opportunity to fit tank heating pads if you wanted to go that route.