color animation used for Btn_LongClick works 1 time only

I used color animation for LongClick but it works only 1 time. If I press second time it doesn't work. I used exactly same for iOS and it works. What can be the problem?

Code:

  ub BtnSOS_LongClick
    BtnSOS.SetColorAnimated(1000, 0, 100)
    BtnSOS.Color = Colors.Black
Event = "sos"
End Sub  

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