Screen Flicker

I am using a fairly small amount of code. The problem is the second section of code (which essentially just clears a range of cells if specific cell is cleared) is causing everything to run slow and flicker. By commenting out the section in question, everything is great. I find it strange that such a small condition could cause this. I have tried various VBA optimizations, but no luck.

Any ideas, or am I stuck with it?

Private Sub Worksheet_Change(ByVal Target As Range)

Dim MyRange As Range
Set MyRange = Range("$C$4:$C$10")

If Not Intersect(Target, Range("$B$3")) Is Nothing Then
MyRange.Value = ""
End If

' The next 3 lines are the problem
If Range("$C$3").Value = "" Then
MyRange.Value = ""
End If

If Range("$C$3").Value = "monthly" Then
Range("$C$9").Value = ""
End If

End Sub