My 2-week old X-T1 started displaying this problem a couple days ago. During half-press of the shutter, it would freeze and nothing works. The AF-assist illuminator would lit up constantly like a search light. Turning off the power switch would not do anything. The only way to power the camera off is to remove the main battery. When the battery is reinserted, the camera would work normally ... until the next time the problem happens.
No grip. Lens is the kit lens 18-55. Card is Transcend SD HC Class 10, 32GB. Shooting in single mode.
So far it has happened 3 times, all of which was when the camera was used in a rather dark room. I have no idea what would be the cause of this problem and would appreciate any ideas you may have.