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Why can't my mobile app unlock the car door on the 2019 model?

My Roewe Max RX5 remote suddenly can't unlock the car doors. Can someone please help me out?

Why does the driver's door not open with the key unlock button after locking the car from the outside, while the other three doors can be opened?

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I have a 2021 Diamond Edition Fengxing T5EVO. After changing my phone, the app's Bluetooth won't connect to the car, and I can't unlock the car with my phone either. The app keeps crashing. What could be the reason?

The car hasn't been driven for just two days, and the door can't be unlocked. I used the mechanical key to open the door, but there's no power at all inside. What's going on?