Getting error 2146697208 when sending an XML document

I am sending multiple XML requests to another server and at some point (which differs every time I run it), I will get "Error: -2146697208 The download of the specified resource has failed."  I have XML requests stored in a database and am using VB 6.0 to send them to another server, looping through each one. Sometimes I can only send 2 requests before I get this error, sometimes 10, sometimes more. I have determined that it dies on the "myxml.Send mydoc" statement and I am at a complete loss as to what causes this error and how to fix it.

Set myxml = CreateObject("Microsoft.XMLHTTP")
    Set myxsl = CreateObject("MSXML2.DOMDocument")
    myxsl.Load ("myfile.xsl")
    Set mydoc = CreateObject("MSXML2.DOMDocument")
    
    CommandText = "Select <<fields>> From <<table>>"
    Set qry = DBConn.Execute(CommandText, , adCmdText)
    
    If qry.BOF And qry.EOF Then
    Else
        qry.MoveFirst
        Do While Not qry.EOF
            '******************************
            'myXMLquery is defined here
            '******************************
            mydoc.loadXML myXMLquery
            Dummy = LogIt("mydoc.loadXML loaded")
            
            If mydoc.parseError.ErrorCode Then
                Dummy = LogIt("mydoc.parseError.ErrorCode = " & mydoc.parseError.ErrorCode)
            Else
                myxml.Open "GET", "http://<<otherserver>>", False
                Dummy = LogIt("myXML.Open successful")
                myxml.setRequestHeader "Content-type", "text/xml"
                myxml.Send mydoc
                Dummy = LogIt("XML document sent")
                
                Set myresponse = myxml.responseXML
                Dummy = LogIt("XML response received")
               
                '******************************
                'now process the response
                '******************************
                myresponse.transformNodeToObject myxsl, mydoc
                'results stored in a database here
            End If
            qry.MoveNext
        Loop
    End If
    
    qry.Close
    Set qry = Nothing
    
    Set mydoc = Nothing
    Set myxml = Nothing
    Set myxsl = Nothing
    Set myresponse = Nothing