Have brought a 2007 e70.

Key fob not working at all, have to use key in the door and it will only open the drivers door. When lock the car with the key it dead locks all doors. Unlock drivers door, alarm goes off until key in ignition.
Every now and again it will open with the button on the dash.
Always locks when press it but takes ages to opening have to press a lot of times.
Checked all fuses and are all OK.

Any ideas??
Thanks in advance