Remote Central locking problem?

The remote central locking on my Renault Laguna RT seems to be very weak, i'm having to put the keyfob up against the window and it takes between 4-10 times before the car locks/unlocks any idea what could be wrong? I'd like to be able to unlock/lock the car from a distance and not have to stand at the window for ages pressing the button.|||I don't know the age of the car, so there for the age of the key, but it could possibly be as simple as a new battery in the key itself.|||yeah, charles is right, I'd bet its the fob battery or at least a dodgy connection inside it, batteries are cheap try a new one