Hello , I'm having problems with my keys !!
main key started playing up , not locking or unlocking on the remote control .
I assumed it was flat batteries , and started using the spare while i ordered some new ones on Ebay . the new batteries came and i fitted them but it still wouldnt work ?? now my spare key fob is playing up ??
strange thing is they will both work if used after the car has been driven for 10 mins or so ?? is there some sort of problem with the reciever rather than the keys ?? does it have battery back up to recognise keys that maybe gets a charge while driving ??
any help please before i have to take it to a dealer and get ripped off ???

sorry if this has been asked before I'm new here and tried looking for answers but couldnt find any !!
by the way I have a 2002 c180 elegance with 2.0 litre engine and new style 3 button key fob