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The hatch rattles, and does not open properly when using the remote key opening feature.
Also, when opening using the rear handle, I get "click-click-click-click" until I pull the hatch open.

All that is wrong is the rubber baby buggy bumpers need adjusting.

These things are located on the hatch at about eye-level when the hatch is open all the way. (Depending on the level of your eyes)

Turned all the way in.

Turned all the way out.

Just twist them counterclockwise to extend them, and test by slamming the hatch.
If it's too far out, the hatch will be too hard to close.
If they are too far in, the hatch will rattle, and click.