Wife has a Picanto and it has been a pretty good car but for one annoying problem: very infrequently say 3 or 4 times a month it takes quite a long time to fire up. It doesn't matter if the engine is hot or cold, it may take up to a minute of turning it over until it starts. The dealer said he could find nothing in the log of the computer so has been unable to do anything. It hasn't got any worse over time and because it happens so infrequently it is difficult to diagnose. Has anyone come across this before?