NRF52832: The app is repeatedly disconnected after the Apple phone is paired with the DFU

[zimo]

Here is my advertising interval and connection parameter configuration(SDK15.0.0 softdevice6.0.0) :

[zimo]

Operation flow:

       1. First connect bluetooth and pair.

       2. Turn off the Apple phone system Bluetooth and then open.

This time the automatic connection will be repeated and automatically disconnected.