Controlling the camera by the smartphone gyroscope - question ...

Hello

I created a scene and i got it to run it on my galaxy s6, The camera is controled by the gyroscope, but its not so accurate. The horizont is tilting about 20 degrees, when i rotate around the y-axis.

My code:

Code (CSharp):

1.     void Start () {
2.         Input.gyro.enabled = true;
3.     }
4.    
5.     void Update ()
6.     {  
7. transform.Rotate (-Input.gyro.rotationRateUnbiased.x, -Input.gyro.rotationRateUnbiased.y, Input.gyro.rotationRateUnbiased.z);
8.     }

How can i avoid this tilting?

Greetings from Germany
Asta