Range Rover tdv8 3.6 limp mode

Hi all.. little advise please... ive a 2008 Range Rover 3.6 v8 sport... starts runs absolutely spot on.. but after a pretty exact distance of 19.5 miles it goes into limp mode... while still rolling turn ignition off & straight back on & it never misses a beat for the rest of the day.. any suggestions ?? thank you... ps it’s not on this private reg now..

You have a leaking PLastic manifold, I have this on my vogue...…..

see this

Anyone know what plastic this is made of?

I had a similar issue with my range rover. It was an overheating issue but the temp gauge showed the correct temperature. When i plugged in to the ODBC port it said the temp had reached 237 deg. When I did a pressure test it was the seal on the filler bottle cap that had faied

Three new members, welcome all