Hello, I have Lumia 925 for about a week now. I have a screen protector film on it. I was playing with it from its top right corner and I noticed that the red light on the top right corner is on. It is not blinking or anything it is just always on when i have the screen locked, and it is clearly visible. When I unlock the screen it turns off. I know it is the proximity sensor, but can anybody tell me why it is always on? Is that normal and what can I do about it?