[MonoTouch] ConnectFailure error causes app to cease connecting externally

[bamagrad03]

I've got an app that does a number of externally focused things: twitter via
oAuth, connecting to my web server services, etc. And everything works
great, but after about 3-4 minutes of heavy use, the app starts throwing:

Error: ConnectFailure (System call failed)

More specifically:

  at System.Net.HttpWebRequest.EndGetRequestStream (IAsyncResult
asyncResult) [0x00000] in <filename unknown>:0 
  at System.Net.HttpWebRequest.GetRequestStream () [0x00000] in <filename
unknown>:0 
  at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke
(System.String method_name, System.Object[] parameters) [0x00000] in
<filename unknown>:0 

Now, I can trap for this. But the bigger issue is, once I get this error,
the app NEVER recovers. It won't connect to my RSS feeds, Twitter oAuth, or
any of my webservices. I continue to get the same connectfailure error until
I restart the app.

Could this be a case of me not disposing manually of some resource that I
should be? Here's some code from my webservice data pull, but keep in mind,
this is only one of many ways I connect.

List<BBStandings> rank = new List<BBStandings>();
			try{
			var service = new ServiceName.Service();
			
			XmlDocument xmlDoc = new XmlDocument();
			xmlDoc.LoadXml(service.GetStandings());
			
			string s = xmlDoc.InnerXml;
			-- bunch of variables declared
			int iCount = 1;
			
			if (s != "<NewDataSet />")
			{
			System.Xml.XmlTextReader xml = new System.Xml.XmlTextReader(new
System.IO.StringReader(s));
			int iXML = 0;
			
			while (xml.Read())
			{	
				switch (xml.NodeType)
				{
					case XmlNodeType.EndElement:
						iCount = 1;
						sElement = "";
						sText = "";
						break;
					case XmlNodeType.Element:
						sElement = xml.Name;
						iCount = 2;
						break;
					case XmlNodeType.Text:
						//sElement = xml.Name;
						sText = xml.Value;
						iCount = 3;
						break;
				}
				if (iCount == 3)
				{
					switch (sElement)
					{
					case "TeamID":
						sTeamID = sText;
						iCount = 1;
						break;
					case "TeamName":						
						sTeamName = sText;
						iCount = 1;
						break;
					case "ConferenceRecord":						
						sConferenceRecord = sText;
						iCount = 1;
						break;
					case "Record":
						sRecord = sText;
						BBStandings r = new BBStandings();
						
						r.TeamID = Convert.ToInt32(sTeamID);
						r.TeamName = sTeamName;
						
						r.ConferenceRecord = sConferenceRecord;
						
						r.Record = sRecord;
						 
						rank.Insert(iXML, r);
						
						iXML += 1;
						sTeamID = "";
						sConferenceRecord = "";
					
						sTeamName = "";
						sRecord = "";
						sText = "";
						sElement = "";
						break;
					}
				}
			}
			}
			}
			catch (Exception ex)
			{
				string s=ex.Message;
			}
			return rank; 

I'm running MD 2.6.0.1
MonoFramework 2.10.5
MT 4.2.2


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