My GR stopped working last year. Initially the problem was that when I turned it on, the lens would extend, but the aperture blades would not open when I pressed the shutter. The first frame would be blank, but then it would work. But then the camera stopped working altogether. This problem has been discussed on DPReview and on flickr:
I then bought a used X100T in the classifieds, think I would wait until this year, when there is likely to be a new GR model to replace my GR. But I miss it too much, and before the year was out bought a used GR II from the classifieds (love the classifieds, never had a bad experience).
I really haven't noticed a difference in the quality of the images between the two GR models, but I'm not a pixel peeper, and generally do some "post" with the RAW images.