Hi All, I'm trying to disable the dial/wheel on the back of my Sony A7R2. Here is the procedure I'm using. Menu/Cog, Gear/8/Dial/Wheel lock/Lock. I also press the Fn button for a few seconds until it says locked. After doing this, I can still move the wheel to access ISO, Display, etc. What am I missing? Is it time to send it in for repair?