I don't have an XT-2 - but do have an XT-10. But I sometimes get the same problem - reddish/pink files.
I'm shooting normally and the colour balance is OK - and then all of a sudden pink pictures. If I enter the colour menus I see that the grid has moved to the far right (pink/red) side.
Somewhere in the buttons there's one that automatically seems to do this. I haven't discovered which one it is. The buttons on the back a quite small and it's easy to press one by mistake and change an all important setting.
I wouldn't mind betting that this is what you are doing - pressing a button inadvertantly