Nissan Tiida 2006: Starting issues

My wife owns a 2006 Nissan Tiida ST and through some strange turn of events my mother owns a 2006 Tiida Q. We have been noticing lately that the car will crank over but not start. After a few goes of pulling the key out and pushing it back in the car will finally start but it is a concern that the car is so new. We mentioned this to my mother and she mentioned that she has a similar issue with her car. Is this a common fault with the Tiida and if so is there a fix available? If not is there anything you could suggest to help me troubleshoot the problem?