Our server application sends data every second to the Hyperterminal trough TCP/IP in the local network. In the random time after 1 - 2 - 3 days it stops send data. Hyperterminal shows connection but no data arrived. Attempt to reconnect to the server fails. Pinging to the server shows 100% loss - the server does not respond. Application does not freeze, it work: updates the LCD, perform I2C communications, output the same data to the serial port. Looks like TCP/IP stack failed only. Appreciate any ideas and advices how to find reason. Keil RL TCP net with RTX Kernel used. All application objects are static (not in heap). Chip is STR912FW44. Application loaded to Bank0 while Bank1 is boot bank.