Sometimes when I start the car and set off, or even mid-drive, the car rises to off road height automatically. And then gives me a warning a few seconds later saying the car will lower if speed is not decreased.

Is this normal?

Hi,
quick answer is No.

take it you have Not selected a special program?
from memory Mud and ruts will go into off road height automatically and "suggest" you select Low box
only other auto off road height is if the car things you have grounded out, which may suggest a height sensor fault

 Porsche Cayenne 2022
gone Porsche Cayenne 2020
gone Corris Grey HSE Dynamic 2016
gone Ipanema HSE lux 2010
gone Rimini HSE 2005
!!

Fill in your vehicle details on your profile so we know car info  Visitor from fullfatrr.com
* GONE. 2012 RR Sport HSE SDV6 Orkney Grey. Now being piloted by RRSTDV8
* Current: 2011 4.4 TDV8 Full Fat. Amazing piece of kit.
* Current. 1974 Lightweight 2.25L petrol. Old skool
* GONE. Freelander GS TD4 Manual MY2013. Orkney Grey with privacy, cold and clearview packs, armrests (a must!) and a spoiler.
* GONE. Range Rover Classic '93 200Tdi Factory fit
* 1949 80" in family since 1975

Could be signs of a sticking EAS compressor exhaust valve. If it is, then it's a new EAS compressor, sadly, as the valve is not serviceable. 2012 SDV6 - it's missing a couple of cylinders
2008 TDV8 - it was a labour of love and is much missed

The EAS exhaust valve is serviceable - I have replaced mine and the parts are available on ebay and from other compressor parts suppliers. 07MY RRS TDV6
Arctic Frost
Aspen Interior