Vauxhall Astra 2008 central locking fault?

Hello. I have a 2008 Vauxhall Astra car with a central locking issue. Key has a new battery. When I operate the remote you can hear the door mechanism working in all 4 doors and the indicator lights flash suggesting it has worked. However not all the doors open and it different doors will be unlocked. Initially I could unlock the driver door and the rear offside door with the remote but not the 2 nearside doors. Using the key to manually unlock the drivers door worked and I started the car to try and reset the central locking. Now it strangely seems the drivers door won’t unlock with the remote and the rear doors will. The key works manually and will start the car fine. Any ideas on what’s causing this issue.? Thanks in advance