Mondeo keyfob prob

hi all
i got as 1998 r reg mondoe a while back and the batteries in the keyfob were flat so i replaced them. I reprogrammed the car as follows:

- Insert the ignition key and turn from position II (Ignition) to position 0 (All off) and back four times within three seconds. - Remove the ignition key. The locking control system is now in "learn mode" for the next 20 seconds and the red warning system LED (By the clock) stays on continuously to indicate this. - During the 20 seconds press one of the transmitter buttons. The remotes signal and code number is learned by the locking module and is indicated by flashing the warning system LED. - Wait until learn mode times out (20 seconds) or switch the ignition back to ON.
that all worked fine for the last 10 months but now its stopped. i did the above again and it appears to have learned it by the flashing LED but nothing. the keyfob battery test glows brightly when held down.
the fuse must be ok coz the central locking works when i use the key in the door.
Any help would be grately appreciated.
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