can not scan device

[asdf]

Hi, I'm using nRF52832 with sdk 13.1.0(softdevice 4.0.2). I had trouble to scan nRF52832 in android smart device.When i disconnect the device a long time when the status is lock screen,then the android device can not find the device(NRF52832).It also cannot find the other device.But I use the other android device to scan device is ok.Then i open the screen,everything will be ok.But i want to scan it when the status is lock screen.What should i do?

[asdf]

When I was last able to scan the device, the following log appeared

12-20 12:06:08.913 2960-2960/? D/BluetoothAdapter: stopLeScan()
12-20 12:06:08.913 2960-2960/? I/BluetoothAdapter: getBluetoothLeScanner
12-20 12:06:08.919 2960-2960/? D/BluetoothAdapter: STATE_ON
12-20 12:06:08.922 1917-2025/? I/BluetoothState: inactive bluetooth uid: 10275, pid:2960, reason:BLE_SCAN
12-20 12:06:08.923 1600-1823/? I/bt_btif: BTA_DmBleObserve:start = 0 
12-20 12:06:08.924 1600-2177/? I/bt_btm: BTM_BleObserve : scan_type:0, 8000, 8000
12-20 12:06:08.924 1600-2177/? I/bt_btm: btm_ble_stop_scan 
12-20 12:06:08.924 1600-2177/? I/bt_btm: btm_update_scanner_filter_policy