If you can gain sufficient access, give linkages and everything in the tailgate locking system a good spray with WD-40. Worked for me on the drivers door locking system which was doing the same thing. As yours works 9 times out of 10, I feel it's more likely to be sticking occasionally as opposed to any impending failure developing in the mechanism.
Regards
John
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Past : 96 855 T5 CD ruby red, 98 C70GT T5 coupe Saffron, 04 C70GT T5 convertible Navy
Present : 95 855 T5R Gul Yellow
08 C30SE Lux T5 Polestar
11 C70 Solstice T5 Polestar
19 XC40 T5 R-Design Polestar
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