Double beep-Doors unlock and lock immediately

[lambrosfl]

Hello all,

About a week ago my 1999 boxster started to act weird while trying to unlock the car.
The symptoms are:
1. Once i press the fob button, the car sounds like it unlocks and locks immediately.
2. While it do3s the unlocking/locking it beeps twice
3. If i try to unlock a couple of times the fob becomes inactive meaning that it won't have any affect to the car anymore.
4. When i remove the fob battery and insert it again, the fob becomes active but the car acts the same.
5. While unlocking/locking, i sometimes get to open the passenger's door.
6. Btw, the can does not unlock with the key. It used to work in the past.
7. If i get in through the passenger's door, and close the door, i can unlock the driver's door by pressing the in car lock button and pulling the door's handle.

Any ideas on what could be the problem?

Thanks
Lambros