I recall having the same issue with mine not long after I brought it so I ordered a new soft close motor from the dealer. Its quite easy to access from the lower left side of the boot. A new motor solved the problem but curiosity got the better of me so I opened up the old motor to investigate. It transpired the Bowden cable which connects the latch to the motor had simply come unhooked inside, so I popped it back on and now have a spare in the garage. It could well be as simple as this.
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