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RTOS/CC2538: program stuck at ZDAppCheckForHoldKey()

Part Number: CC2538

Tool/software: TI-RTOS

Hi All i am stuck in a problem. I have a cc2538 custom board and it is running as a router. the problem is that code is stuck after 3 or 4 downloads of code and it is stuck at hal_key_keys(); ZDAppCheckForHoldKey(); what can i do? Please help.