The Mégane II Owners' Club

I parked my car for like 30 minutes in front of a mall, came back to it, unlocked the doors, got in, put the card in the slot, press start, and nothing happened. The screen said: "Card Reader Fault" or may be "Card Reader Failed" I can't remember. I took the card out, press start, the screen said "Insert Card", I put the card back in and it said "Press brake and start" as usual, I did and it started normally.
I am due to service and some repairs in Tuesday, Do you think something is wrong with the reader? should I get it changed? I will be traveling a lot during the summer, I don't want it to fail completely on me while driving through the desert!
does anyone know what does this message mean? "Card reader failed"

they do that if there's an interference nearby. like mobile phone for instance.

or when the card battery is due replacement

Oh, Thank you for the reply.
I was worried because I thought that the "START" function was not dependable on battery or interference, I thought only the doors and center lock are, But if you know that it is, then I am relieved Thanks again, I appreciate it very much.