Spinbutton Incrementing Crashes Workbook

I use spinbuttons to increment 3 data cells (C7:C9). These cells are used as entry data for some calculations and also trigger some macros via change event. Every time I use them the workbook crashes, this is only since I modified one of the instantiated macros that sorts a table on another sheet. See below the spinbutton code with the call of the macro and further the code of the sorting macro:

Private Sub SpinButton1_SpinDown()
Range("C7").Value = Range("C7").Value - 0.05
End Sub

Private Sub SpinButton1_SpinUp()
Range("C7").Value = Range("C7").Value + 0.05
End Sub

Private Sub SpinButton2_SpinDown()
Range("C8").Value = Range("C8").Value - 0.05
End Sub......................................................