Air suspension, DSH, ABS, HSC in inactive mode. Inactive_indic in dash board

Here is.
That failures appeared at date of purchasing (the region is UAE). Then I come back home and was driving down from highway to worn-down (driving carefully about 200 meters).
After that, I stopped and switched off/on engine and that errors were eliminated therefore I have continued driving and after the running on the flat road that have been raised again.
I have kept the car in flat parking for a night and found out at the morning time that the car has not been fell down from any side. Also, I tried to remove minus terminals from battery for 1hour but without any result. How can I check myself what else this could be? I don’t want to waste money for stuff which should not be checked or changed?

ps: I have checked the suspension before make the deal and the only problem was indentified; that is time delay for lifting the car for high position (8-10sec).

Car spec
VIN SALLMAMA44A142827

Range Rover 2003 y.B HSE 4.4 UAE spec.
Tnx