The display in my 2017 Haval H6 Lux keeps showing faults and the electrics are playing up

Any time a mechanic sees an illogical pattern of faults like these all at once, their suspicions are always drawn to the body computer. This computer controls all the functions you’ve mentioned as well as hundred more, and when it goes on the fritz (as computers are wont to do) you can suddenly get all sorts of weird behaviour, just like you’re reporting.

Take the car to an auto electrician who might be able to make sense of what could be a complex wiring issue. But the smart money says body computer every time. These can be replaced by a new computer, second-hand ones from a wreck and sometimes even fixed by very clever people. If the auto electrician can’t offer any advice, get online and see what help is out there.