I'm trying to download Witcher 2 (for Windows), but when when it downloads about 2,8 GB, it is starting to... I don't know how to say it. It's not just that it's stuck, but it goes back. After couple of minutes it's 2,7, then 2,6. And at this point it downloads normaly, and than, again, at 2,88 goes back. I tried restarting downloader, but it doesn't help.