My X-T1 has just gone back to Fuji a second time for the same problem. When I turn on the camera, the rear lcd display begins flashing (alternating between black and whatever the camera is pointed at every second.) Check out this YouTube link: https://youtu.be/ZEe0O8eWQCk. All camera functions (other than on/off) are frozen when this happens.
When I sent it (along with my lenses) to Fuji in December, they were able to replicate the problem only once, and never again. They finally shipped it back to me 6 weeks later, having basically only upgraded the firmware. Camera was fine for about 50-60 shots, then the problem returned. The problem appears NOT to be lens related, since the problem occurs with both my Fuji lenses, as well as a random Fuji lens supplied by the retail salesperson. Someone suggested it could be the Auto Focus motor; I've also heard about a problem with the ribbon that connects the lens to the body, but I know nothing about that.
Anyone else experienced this problem and found a fix? Thanks