It's not the app that opens the car automatically, it's the bluetooth connection.
So when I'm having trouble with it...
1. Air logo reset
2. Restart phone
3. Forget and re-pair Bluetooth.
I also have a Samsung (A32) and recently, I've noticed that my phone has to be unlocked before the car opens. It shouldn't have to because my bluetooth earpods connect without unlocking the phone but

If it really starts to bug me, I'll try re-pairing or restarting the phone.