All-in-one key with integrated RF unlock and chip. The former controls the door and the latter is a chip that is detected wirelessly after the key is inserted, and the sensor is around the keyhole, so it has nothing to do with the battery. Generally, the chip position is not correct or the signal is shielded due to private key modification; Or a chip sensor failure, which is less common.
Your loss of power may not be enough. Or you really don't have a key on you. But you can't open a car door without a key. You turn the car off, and then you restart it to see if you can start it.