Successive WebBrowser calls taking up memory

Running the following code is giving me Virtual Memory warnings when I get to about the 5,000th call(keyword).

' User calls this to start running the AutoBrowse program
Public Sub StartItAllUp()
Dim rngCategory As Range, rngKeyword As Range

Set rngKeyword = Application.Selection

frmWebWindow.axcBrowser.Navigate GetAddress(rngKeyword.Text)
End Sub

' When navigation to my keyword is done this events get fired by the WebBrowser control
Private Sub axcBrowser_DocumentComplete(ByVal pDisp As Object, URL As Variant)
AutoBrowseKWApproval
End Sub

Public Sub AutoBrowseKWApproval()
dim strBrowseResults as String

strBrowseResults = frmWebWindow.axcBrowser.Document.body.innertext

' [code here that uses the strBrowseResults to in/validate the Keyword in question]

Application.Selection.Offset(1, 0).Select
Set rngKeyword = Application.Selection

If rngKeyword.Text <> "" Then
frmWebWindow.axcBrowser.Navigate GetAddress(rngKeyword.Text)
End If
End Sub