RTOS/TM4C1294NCPDT: Sometimes I failed to ping my arm's IP address after working for a while

Tool/software: TI-RTOS

Hello,

My board is TM4C1294NCPDT ,and I am using CCS7.3, tirtos_tiva_2_16_01_14, bios_6_52_00_12  .

My problem is at first my ARM works well,but if it works in a complex network environment for a while,sometimes I fail to ping my board again,but other tasks works well.That is to say the ARM is OK,just the network is down.

So,I want to ask is there any problem with the ndk? And,How can I detect the status and then reset the ARM?

Thank you!