I've got a Seat Leon Mk2 57 plate, only done 70k, had it about 7 years now, great car and spent very little on repairs over the years, but since last week I've been unable to unlock the car with the key fob, yet it's ok to lock it. I pulled it apart yesterday as per youtube video and didn't remove the battery, and it worked ok for half a day, then it stopped working again. I pulled it apart again earlier and it's working again, but it's probably going to stop working again soon. I only ever had one set of keys when I bought the car in an auction 7 years ago. It can't be the battery as it locks ok. Any advice on how to fix this?