Hello Warren,
Did you get this issue fixed under warranty? I'm having a similar issue, and both Fujifilm and the camera store are unwilling to fix it under warranty, even though the camera is only 10 months old and has always been handled with great care. I strongly feel this is a design flaw in the way the on-off switch collar is attached to the body. I have used several Fujifilm X cameras and this is the first one to have such quality issues.