Key card question.

So... Ii have a bit of a problem with my keycard, had a search about and haven't really found anything the same.
Had the car three year and never had to use the card, always kept it in my pocket using keyless entry and start.
Until the start of this yeah when I changed a battery in it. The battery was swapped over straight away and everything was fine. About three weeks later it started to be a bit temperamental. Not unlocking and not starting, even if I change the battery still exactly the same. The spare key is also the same. Now the car will open and lock fine using the buttons on the key but will not keyless. The only way the car will start is to unlock it while sat inside and then straight after press the start stop button. Even the card reader itself will not read the card! Anyone ever had to change a card reader or had this problem?
 

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