Bug with impulse

Hi,
I'm doing some test with impulse. In my scene I only have one single impulse.
Calling it is no issue but sometimes after the impulse is played it repeat it self with no real reason. The function is only called once and to be sure I even set amplutude and frequency to 0.

Code (CSharp):

1.  
2.     public CinemachineImpulseDefinition foxImpulse = new CinemachineImpulseDefinition();
3.  
4.     public static ImpulseManager instance;
5.  
6.  
7.     void Start()
8.     {
9.         instance = this;
10.     }
11.  
12.     private void OnValidate()
13.     {
14.         foxImpulse.OnValidate();
15.     }
16.  
17.     public void PlayFoxAttackImpulse()
18.     {
19.         foxImpulse.m_AmplitudeGain = 1.0f;
20.         foxImpulse.m_FrequencyGain = 0.8f;
21.  
22.         foxImpulse.CreateEvent(transform.position, Vector3.down);
23.     }
24.     public void StopFoxAttackImpulse()
25.     {
26.         foxImpulse.m_AmplitudeGain = 0.0f;
27.         foxImpulse.m_FrequencyGain = 0.0f;
28.     }

 

Here's a screen of the impulse.