I can not use manaul release to open, only switch on key. It continually opens on it's own unless I lock all.
The problem will almost certainly be either an intermittent short in the switch unit (under the rear wiper fixing) or water ingress under the rear spoiler on top of the rear tailgate glass causing a short where the switch connects to the vehicle wiring.
The most probable cause will be a short in the switch itself.
You can prove this by removing the trim on the inside of the glass (behind where the switch fits- 2x 10mm nuts) and disconnect the switch there.
Replacing the switch involves removing the wiper arm (13mm nut) and the switch unit itself (24mm Nut and another 10mm on the inside of the glass)
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