Help me! WordPress Does not publish long posts

Hi everyone.

I’m using WordPress right out of box, with no additional plugin activation or any tweak at all. But I have a big problem: It does not publish long posts. Usually, when posts have more than around 1550 words, they just don’t update. And it is like this: “If you paste a 2000 word article, it won’t publish at all, if you paste a 300 word article first and add more 1700 words to it, it just don’t update!”

In past few days I searched lots of forums for the issue and I just haven’t found a single answer for it. Please help!