Hi 3 times over 2 months my cluster goes blank for only one second?
2016 AB.
Any ideas?

It happened to mine once. I researched online and found there was a US recall for my17 that had this fault for the software to be updated. I went to the dealer and asked about it. Of course they just looked at the system (UK) and said there were no recalls outstanding. The fault did not manifest itself while the car was with them, indeed it has not done it again. You could try getting a software check/reboot. Only Range Rovers since 1988