Server determined import problem

Hi.
I have problem with All import. I send you few emails but without any answer. I imported products in my own language, alsom 2000 products and everything went smooth. Then I try to import translate of products and my import get server determined import eror on 5%, every time. I tryed everything, lowering import, contact my host, turn off my other plugins, everything but everytime i get same error on 5% of my import.