在Android中，BLE信标的发送需要通过Service和Broadcast实现。如果Android停止发送BLE信标，可能是以下原因导致：

1. 进程被杀死
2. 蓝牙适配器关闭
3. BLE服务被关闭

为了解决这个问题，可以在Service中重启BLE服务，同时监听蓝牙适配器状态和进程状态变化。以下是代码示例：

public class BleService extends Service {

private BluetoothManager mBluetoothManager;
private BluetoothAdapter mBluetoothAdapter;
private Handler mHandler = new Handler();

private Runnable mRestartBleService = new Runnable() {
    @Override
    public void run() {
        if (mBluetoothAdapter.isEnabled()) {
            startBleAdvertising();// 重新发送BLE信标
        } else {
            mHandler.postDelayed(this, 1000);// 每秒检查一次
        }
    }
};

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    mBluetoothManager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
    mBluetoothAdapter = mBluetoothManager.getAdapter();
    registerReceiver(mBluetoothStateReceiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
    mHandler.post(mRestartBleService);// 开始发送BLE信标
    return START_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();
    unregisterReceiver(mBluetoothStateReceiver);
}

private BroadcastReceiver mBluetoothStateReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        final String action = intent.getAction();
        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
            final int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
            if (state == BluetoothAdapter.STATE_OFF) {
                stopBleAdvertising();// 停止发送BLE信标
            } else if (state == BluetoothAdapter.STATE_ON) {
                mHandler.post(mRestartBleService);// 重新发送BLE信标
            }
        }
    }
};

private void startBleAdvertising() {
    // 发送BLE信标的代码
}

private void stopBleAdvertising() {
    // 停止发送BLE信标的代码
}

}