Not sure if it helps - but I just realized - I've never detached my grip from XT2. Always use only 2 batts. Which I guess means - its not the case with contasts between body/grip.
What happens is I put the plastic tray with charged batts to the grip - they reed: empty stright away - so I take them out and in - and it works. So for me - it would rather mean - the contacts inside the grip. Fuji - as I predicted - didnt find any issue with it. (apart from this - the camera freezes on ocasions, quite rarely. i guess I have to live with that, but Id never suggest anyone to buy xt1/xt2 for serious work. I do use it for serious travel - and I learned how to live with its flows. Id still use Nikon d700 - which was the Machine!!... except too heavy with lenses)