SPWF04 MiniAP Stuck

I am using SPWF04 module for embedded web server application and spwf04 configured in MiniAP. In my application  i am continuously posting data to the web pages, after some time wifi module get stuck. The access point is still up, but i cannot able to reconnect to the access point and module is not responding to any serial command. Then i have to reset the wifi module for reconnect to the access point.