Last week one of my remotes stopped working - no indications that battery was on its way out - in fact the opposite was working well. Have used the spare since then. Read a few threads where there were rumours of the igntion/contact recoding the key, but this was refuted as it comprimised the security of the key. Well, I just opened the locks with the working key (1st key still not working) placed the dead key into the ignition and started the car. Turned it off and started it again with working key. Then locked and unlocked the car with the problem key - it's now working fine. Any ideas what has happened here?