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CC2642R-Q1: passkey_entry disconnect but fail to reconnect

Part Number: CC2642R-Q1

Hi engineers,

My customer is using CC2642R-Q1 as peripheral node and a non-TI BLE chip as central. Connected via passkey_entry successfully. 

The problem happens every time customer try to power-off the central node and re-power it. CC2642 did not reply and connection fails. Only reset CC2642 can make it work again. Do we have any reference direction to debug?