I’m not an expert but sounds like the strut is worn out. Are you planning to take it to the dealer or a LR specialist? I used to go to the dealership for everything but have found a few LR specialist and they are much cheaper and will give you options for parts and repairs vs the dealership which charges an arm and a leg for their parts. I’ll go with the dealer parts in some instances but for something like the strut on your lift gate, if that needs to be replaced, I wouldn’t pay dealer part/prices.