Hi, I am a 78yr old retired commercial radio communications engineer. My hobbies are amateur radio and reading. Before I had a fall and wrecked my right shoulder I was a self taught organist, and played the BBb bass in brass bands. I presently have a problem with my I pad 4 in that there is a notification in the middle of the screen that says 'Compass interference'. I have complied with all the instructions , including taking it away from the house, but is still there. Thought of doing a total reset but this seems a rather drastic solution.