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CC2642R-Q1: unexpected terminating when repeat disconnect and connect after bonding.

Part Number: CC2642R-Q1

Hi engineers,

My customer is reporting a termination issue between CC2642 and a bonded phone.

SDK version: 5.20

reproduce environment: seldom on out of box simple peripheral example code. frequent on customized code.

reproduce steps are easy, keep disconnect and reconnect to CC2642, sometime the phone will notify disconnect due to the pairing message does not exist. But this issue can be fixed by both re-pairing and reset bluetooth (without re-pairing). Any ideas on this issue?