Thanks @Frederic. Mine is a 3.8l LWB 2018 model year with 13k on the clock, so quite new. I did have the transmission overheat issue which was mainly when I was driving in “D”. Using tiptronic makes the situation much better. I opted not to install a fan since my car is still in warranty. At the 10k checkup with al habtoor they told me the transmission fluid is fine and doesnt need changing, which was the opposite advice to a 3rd party garage which told me the fluid seems like it should be changed. Again, i havent done it due to the warranty, and the last couple of drives including liwa the car fared much better due to the cooler weather and driving in tiptronic all the time (even on easy dunes and flat areas). My tyre pressure when off roading is normally 13 psi.
would be glad to learn from other peoples experiences on this subject