Not aware of particular weak points, but I would start by removing the interior panel and looking at the door lock mechanism, and the actuators.
Might be some wear there.
Best of luck,
Andres
2013 XC70 T6, Premier Plus, BLIS Black/Black 18K miles, stock
2004 XC70 Premium, Convenience, Climate Blue/Tan 122K miles, 2007+ ABL lights, IPD sways F & R, TME exhaust, SS brake lines, R Brembo calipers & rotors, Akebono ceramic pads F & R (replaced PCV, power steering rack, struts and springs, end links, ball joints, A-arms, all fluids)
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