Power Rear Gate Rod: Inspection
WARNING: This page is about a different car, the 2016 Subaru Outback, 2016 Subaru Legacy, 2015 Subaru Outback, and 2015 Subaru Legacy. However, it is still accessible from the selected car via links, so may be relevant.
Check the ball housing and ball stud (bracket rod - power rear gate) of the rod - power rear gate for excessive play, wear or bent. Replace the rod - power rear gate if defective.