Fiat 500 (312) sometimes starts badly?

Hello, I'll start with some data Vehicle: Fiat 500C (312) from 2011 Mileage ≈ 85,000km 1.2l, naturally aspirated, 51 KW / 69 HP Engine code: AXA1A With air conditioning, without start-stop Issue: The vehicle occasionally starts at irregular intervals, sometimes smoothly, sometimes poorly. It always starts, but sometimes it takes a while before it starts….