PDA communcation error

[ram2008]

I have a PDA application running on Windows Mobile 5. My application communicates to a WebService for data and it is working fine with 200+ PDAs. But some times randomly one or 2 PDAs stops communicating and I get a socket exception. Right now it is not wring the actual error, because of the Sys_enu file(I am installing that CAB soon). But still we get an idea from the message below:<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>
System.Net.WebException: An error message cannot be displayed because an optional resource assembly containing it cannot be found ---> System.Net.Sockets.SocketException: An error message cannot be displayed because an optional resource assembly containing it cannot be found<o:p></o:p>
at System.Net.Sockets.Socket.ConnectNoCheck()<o:p></o:p>
at System.Net.Sockets.Socket.Connect()<o:p></o:p>
at System.Net.Connection.doConnect()<o:p></o:p>
at System.Net.Connection.connect()<o:p></o:p>
at WorkItem.doWork()<o:p></o:p>
at System.Threading.Timer.ring()<o:p></o:p>
<o:p> </o:p>
at System.Net.HttpWebRequest.finishGetResponse()<o:p></o:p>
at System.Net.HttpWebRequest.GetResponse()<o:p></o:p>
at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse()<o:p></o:p>
at System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse()<o:p></o:p>
at System.Web.Services.Protocols.SoapHttpClientProtocol.doInvoke()<o:p></o:p>
at System.Web.Services.Protocols.SoapHttpClientProtocol.doAsyncInvoke()<o:p></o:p>
at WorkItem.doWork()<o:p></o:p>
at System.Threading.Timer.ring()<o:p></o:p>
<o:p> </o:p>
Please help me, if you have any clue?:confused: