Problems with Central Locking

I have a 1998 S Reg Micra that has the standard Nissan Remote Central Locking. When I bought the car back in 2004 the garage said there was a problem with the central locking and would fix it before I collected the car which they did and the central locking worked for some time then it stopped. I searched the internet and came across the instructions on reprogramming the fobs which I tried and managed to get it working again. This lasted for about 18 months until it stopped working once again. I changed the fob batteries, tried reprogramming them and even unplugging the main car battery for a minute to reset the car but nothing works. I've tried several times over the past 2 years to get it working again without success.

Does anyone know what could be wrong?
 
Has anyone got any ideas of what the problem could be? The remote central locking still doesn't work.

Just to add, the fobs are the Siemens Fobs that look like this:

NissanFob.jpg


Thanks
 
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