Solved

Driver didn't want to pit.

Like as said in the title, the driver didn't want to pit in, while the pit was obviously required. 
The driver did two turns without entering the pit before an obvious DNF and quite an ammount of points lost in the process.

i had the same problem in a race but at the next was everything ok i never understand what happened...

Upping my post because it happened again tonight......And lost major points again... Seems like the game didn't want me to stay.

Any news for the correction of that bug?

Hi Ward, I'm sorry, I did not see this post when you originally posted it. I may have overlooked it.

I've noted both of the races you had the problem with and have forwarded the information to the developers to review.