a week ago i started having trouble opening n locking my car with key remote. at that stage i thought it might be time to replace the battery perhaps, but a few days ago the key totaly stop working (meaning lockin and un-locking). now the car will only lock and unlock if i insert it into the keyhole on driver side. any suggestions or place i can take it to get fixed??? please assist. im am driving 2003 e46 320i