Rossz1 it sounds like the it could be a sensor related issue.
I had similar problems with it not starting occasionally and also had the ESP light and Skid Warning light on ...
Have a look at the following thread, it might be useful .... My problem turned out to be the Crank Position Sensor, but there are a few different sensors which could be causing your issue.
viewtopic.php?f=10&t=27455
Hope that helps mate