I have a Mazda Millenia and just recently I noticed that it cuts off after I've been driving then say I pull up to a light it then cuts off and I'm able to start it up again with no problem, but if i stop again for more than 15secs it shuts off.

Could this be the battery, Spark plugs, starter or what? This just started happening and I can't understand why.

Any help would be appreciated.

Thanks
Raymond