这个问题通常是由于连接时间超时引起的。可以通过以下步骤解决这个问题：

1. 在BluetoothGatt.connect()方法之前，使用BluetoothDevice.connectGatt()方法，设置连接超时时间：

BluetoothGatt mGatt = device.connectGatt(this, false, mGattCallback);
mGatt.connect();
mGatt.requestConnectionPriority(BluetoothGatt.CONNECTION_PRIORITY_HIGH);
mGatt.setTimeout(5000);

在这个示例中，我们将连接超时时间设置为5秒钟。

2. 监听BLE连接状态，如果在连接时间内没有成功连接，就使用BluetoothGatt.disconnect()方法手动断开连接：

private static final int STATE_DISCONNECTED = 0;
private static final int STATE_CONNECTING = 1;
private static final int STATE_CONNECTED = 2;

private int mConnectionState = STATE_DISCONNECTED;
private BluetoothGatt mBluetoothGatt;

private final BluetoothGattCallback mGattCallback =
        new BluetoothGattCallback() {
            @Override
            public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
                if (newState == BluetoothProfile.STATE_CONNECTED) {
                    mConnectionState = STATE_CONNECTED;
                    mBluetoothGatt.discoverServices();
                } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                    mConnectionState = STATE_DISCONNECTED;
                    mBluetoothGatt.close();
                }
            }

            @Override
            public void onServicesDiscovered(BluetoothGatt gatt, int status) {
                super.onServicesDiscovered(gatt, status);
                if (status == BluetoothGatt.GATT_SUCCESS) {
                    // service discovery successful
                } else {
                    // service discovery unsuccessful
                }
            }

            @Override
            public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
                super.onCharacteristicRead(gatt, characteristic, status);
                if (status == BluetoothGatt.GATT_SUCCESS) {
                    // characteristic read successful
                } else {
                    // characteristic read unsuccessful
                }
            }

            @Override
            public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
                super.onCharacteristicWrite(gatt, characteristic, status);
                if (status == BluetoothGatt.GATT_SUCCESS) {
                    // characteristic write successful
                } else {
                    // characteristic write unsuccessful
                }
            }

            @Override
            public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
                super.onCharacteristicChanged(gatt, characteristic);
                // characteristic value changed
            }
        };

public void connect(String address) {
    final BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
    if (device == null