Response XML returns with junk characters

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VBScript

XML

We are maintaining a classic asp web site, when a users logs into the site a vbs scripts gets a XML file from the server through XMLHttp object and then parses the XML and does the some further processing. My problem is that the Response XML gets appended with some sort of junk characters F vVO \3ӱ and due this the XML is not parsed and the application halts. This does not happen every time and we are yet to reproduce this at our development environment. However some users are experiencing this issue quit often.
Following is the function used to get the XML

Function fsendHTTPGet(lFName, lObjXML)
	   Dim oMsg, retVal
		
	   set lObjXML = CreateObject("MSXML.DomDocument")
	   set oMsg = CreateObject("Microsoft.XMLHTTP")

	   call oMsg.open("GET", lFName, false)
	   call oMsg.setRequestHeader("Content-Type", "text/xml-SOAP")
	   call oMsg.setRequestHeader("Internal", "true")
	   call oMsg.send()
	   lObjXML.async=false	
	   'lObjXML.load(lFName)	
	   lObjXML.loadXML(oMsg.responseText)

	   if fParsed(lObjXML)<> true then 'checks if the object contents valid XML
		   set retVal = window.open() 
		   retVal.document.write(oMsg.responseText) 'here i can see the repsone XML with junk characters appended at the end. One of the users had send us the screen of this.

			fsendHTTPGet = "false"
			msgBox fDirectGetValue(gClientSideLiteralXMLObj,"ServerError")	'"Invalid server response : Parse Error"
	   else
			'if error then always show message
			if fDirectGetValue(lObjXML, "XML/Error/@ErrorNo") = "TimeOut" then
				if sMessage <> "" then
					msgBox sMessage
				end if	
				call fDoRedirect(fDirectGetValue(lObjXML, "XML/Redirect"),"")
				fsendHTTPGet = "false"
				exit function
			end if

			fsendHTTPGet = "true"
	   end if

	End Function