We had the same problem. Took it to the dealer and 5 days later:
"verified customer concern that rear latch is not locking performed visual inspector and found rear lid is not closing all the way scanned vehicle and found fault for vx16 assist motor open circuit follow test plan looked at wires connections and voltage everything looks fine, voltage is reading at 12v, was advised by test plan to replace vx16 assist motor, replaced motor, performed coding and basic settings after all that rear door still would not close all the way so i tore into the trunk to get to the j605 to check the wiring and found that the connected to the j605 was barely connected and not seated properly plugs in connector and now everything is working as it should be"
"verified customer concern that rear latch is not locking performed visual inspector and found rear lid is not closing all the way scanned vehicle and found fault for vx16 assist motor open circuit follow test plan looked at wires connections and voltage everything looks fine, voltage is reading at 12v, was advised by test plan to replace vx16 assist motor, replaced motor, performed coding and basic settings after all that rear door still would not close all the way so i tore into the trunk to get to the j605 to check the wiring and found that the connected to the j605 was barely connected and not seated properly plugs in connector and now everything is working as it should be"