Thank you!!The tailgate issue you have mentioned is a classic symptom of a battery problem. The Evoque is quite fickle when it comes to batteries.
I am on another forum, Evoque Owners Club, and there are many posts regarding this very thing.
Almost always, a new battery cured the tailgate, low battery warnings, and a Myriad of other problems seemingly unconnected to the battery being past its best.
On one or two occasions, dealers have tested batteries and declared them OK when a new battery eventually solved the problems.
It might not be the solution for you, but just sharing information I’ve picked up.