1. I was Amateur 15 earlier today, now it says i am Novice 13, wtf so you can loose your rank and why suddenly ?

2. People either dropped from the game before the race even started or suddenly in the middle of the race everybody leaves except me and this happend more then 3 times in a row ???

i think that is just your online rank, so the more you play on line the higher your rank is so if you dont play for a while maybe your ranking goes down vs others going up cause they have played...
mine goes down too c

Typically that means your internet connection is crappy and YOUR the one leaving the race. Though your console doesn't know any better so to you it looks like everyone else does. This used to happen to me a lot in PGR2 when I lived in an apartment with a crappy cable connection.

BTW that adversely affects your rank which is probably why it's going down.