disconnect reason 0x28

[strengthstrong]

When I use sdk14.2.0 nus service communication for some time, the connection suddenly disconnected, disconnect reason error code 0x28 ,I do not know what it means, I do not know how to solve.

[strengthstrong]

I USE MAX_CONN_INTERVAL=75 msec, MIN_CONN_INTERVAL=20 msec,and i use sdk14.2.0 uart example , i also have this question BLE_HCI_INSTANT_PASSED, when i Connect thirty or forty minutes.and i do not handle any data that received from nus service. i also run pwm ,Do not know if it will be affected