Well my update.
FIRSTLY, whenever I open the tailgate I now give the cargo floor liner a little push forward as I found it can creep back and cause some of the issue.
Second when it rarely occurs now I pull fuse (#50?) under the hood and refit after 10secs. This generally resets it and it starts to work....but still not always.
Other gripe I have with the powered tailgate is I now have a dent from where it opened up in a Westfield carpark (ref pic under Jeep logo). Seriously I'd much rather a manual tailgate with a seperate opening glass lift.
Stupid Jeep engineers.
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