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CC3220SF: CC3220SF custom board auto disconnect from ap when run sample code "tcp echo"

Part Number: CC3220SF

Hello team :

I encounter some problem when i run sample code "tcp echo" in my cc3220SF custom board.

when i run sample code in EV board , everything is good.

But when run in custom board, sometimes socket can not be enabled;

sometimes socket is been enabled but did't receive data transmited from tcp client

and most important , custom board will disconnect from AP randomly.