I have a Civic 1.4 2000 vintage auto and just recently it has picked up a bad habit, namely refusing to start or stalling when driving, when this happens the green key logo on the dash starts to flash and the engine dies or will not start. switch off and try again to start and sometimes it does sometimes it doesn't, !! is this the immobiliser or the chip in the key playing up ? Can anyone shed some light on this please ??