iPhone 5 gyroscope behaving badly

Question

I am in the process of developing an iPhone app that uses the devices X and Y CMMotionManager orientation.

When I've been testing my app on ipod touch's and iPads I've had no problems when I place the device on a level surface the X and Y attitude variables equal roughly 0.

BUT

When I tested it on an iPhone 5 the Y variable was equal to around -6 and the X about 6 on the same level surface!!

Is this an ios bug? or something wrong with my code?

Any help with this would greatly appreciated.

This is my code btw:

    motion = gyroscopeManager.deviceMotion;
  NSString *x = [NSString stringWithFormat:@"%f", 180 * motion.gravity.x / M_PI];
 NSString *y = [NSString stringWithFormat:@"%f", 180 * motion.gravity.y / M_PI];

Answer 1

I found the problem! in another section of my code I had included a method that checked the devices acceleration, when I removed this method the gyroscope behaved normally!