I still have this problem on my 2004 Opel Astra. When it sits for about 15-20mins I have problem starting, but I just have to start it for about 5 seconds inste

I still have this problem on my 2004 Opel Astra. When it sits for about 15-20mins I have problem starting, but I just have to start it for about 5 seconds instead of instantly. Longer or shorter pauses are ok.