Card Reader fault

[dwgendy]

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"

[Ray]

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

or when the card battery is due replacement

[dwgendy]

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.