No LRA. It seems to happen mostly when spending long periods of time at low speeds on trails in groups with frequent pauses off-camber. Its notorious in Moab, but also happens here in Arizona. As far as ambient temps go, I'm not sure I've noticed it when wheeling in snow or in the cold, but certainly it happens at Cruise Moab in April which certainly isn't hot by any means. I'm not sure my truck has ever spent time below 1000ft so its hard to say what role altitude plays. It doesn't happen under normal driving conditions.
There is a ton of theory on the topic across many threads, including this one, but the most plausible at this point has to do with the way the engine uses excess fuel being pumped, to cool parts of the engine and then returning it to the fuel tank at a very high temperature. In those long crawling situations, you are theoretically returning a higher volume of heated fuel to the tank due to the fact that the fuel pump is pushing full volume at all times. I'm working on an experiment to add a fuel cooler to the return line, but haven't had the stones to actually do it yet.