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Hello, my name is John.
Your Range Rover has air suspension rather than the traditional shock/strut type suspension. It sounds like you have an air leak somewhere in the system or possibly failed air pump for the air suspension. Leaks are common in the air lines close to the air shocks and also in the air shocks themselves. If the pump for the air suspension can run then you can listen for the air leaks. If the pump does not run then that will have to be addressed first.
These can be complicated systems and I am happy to help you with information and diagrams as much as possible. So please let me know where you would like to go from here.