The biggest issue with Range Rovers is the initial quality - problems right out of the factory on a new vehicle. I experienced it with my 2019 RRS ATB. It had four problems at delivery that took a month and half to get sorted, including a return visit to fix interior trim damage that the dealer caused to the car when fixing the other issues. The biggest joke was that they put the wrong steering wheel on the car - they put an L405 wheel on, not the sport steering wheel for the L494. The dealer thought I was crazy, but I insisted it be corrected.
Once you get past the initial quality issues, these cars are as reliable as any other luxury brand. They all have their own issues. I will say that the Range Rover dealers are notably worse than other luxury brands from a service perspective.