GPRS upload problem

Hi, I use a TC45 module to transmit data via gprs.
This works fairly well abou 90% of the time, the rest returns java io exception. This does not happen in a specific order or at a specific time, just randomly. The fact that the network might be the problem have been ruled out.
I'm fairly new with cellfone modules and just took this code over so any help would be appreciated.

I initialize my GPRS in the beginning as follow:

        try
        {
            Jnet = "at^sjnet=ppp,\"\",\"\",\"\"";
            Kry = ATCmd.send(Jnet + "\r");
        }
        catch (ATCommandFailedException e)
        {
            System.out.println(e);
        }
        try
        {
            Jnet = "at^sjnet=gprs,internet,\"\",\"\"";
            Kry = ATCmd.send(Jnet + "\r");
            System.out.println(Kry) ;
        }
        catch (ATCommandFailedException e)
        {
            System.out.println(e);
        }  

and the following are repeated every say 3 minutes.

         try
         {
                 HttpConnection connection = (HttpConnection) Connector.open(URL);
                 connection.openDataInputStream();
                 Rcvhttp = connection.getResponseMessage();
                 connection.close();
          }
          catch (IOException e)
          {
          }

with Rcvhttp == "" when the exception gets thrown

any suggestions welcome

Thanks