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]

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scannerHuaWei = mBluetoothAdapter.getBluetoothLeScanner();
            callbackHuaWei = new ScanCallback() {
                @Override
                public void onScanResult(int callbackType, ScanResult result) {
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
                            connect(mBluetoothDeviceAddress);
                    }
                    super.onScanResult(callbackType, result);
                }

                @Override
                public void onBatchScanResults(List<ScanResult> results) {
                    super.onBatchScanResults(results);
                }

                @Override
                public void onScanFailed(int errorCode) {
                    super.onScanFailed(errorCode);
                }
            };