Twingo doesn’t start

Hello, I have read a lot here now, but the problems that are described here to not start are exactly the opposite as with me. So to my problem. My Twingo is a petrol and built in 1998. I had bought it new and so far no major problems. Last year late summer I noticed that it didn’t start directly. But what was only a few times. Then came the winter and I had no problems. Now it is 4 weeks again warm and with Every degree is worse. I try to start it, but it doesn’t start. I try it five to six times (with a pause of about a minute in between) and then it starts. Sometimes it also goes out at the intersection, but then it jumps right back up. My husband has already changed the spark plugs and cleaned the air filter but it doesn’t seem to lie there. The bad thing is he doesn’t really believe me, because he drives all the plugs. for weeks on the night shift with my car and then it’s cool and it starts. So it doesn’t happen with him. But he was already there when it happened just I drove there. And as it is so nice to say “woman at the wheel”. That’s why I’m asking here to say that the woman I saw has a clue. So please help me. Susanne