Few weeks ago, i created a link wheel for my site. It had about 12-13 spokes(not sure ) . Then one day i saw that google indexed about 7 of them and i was doing well on the serps. But today when i checked my site, i see only 3 of them, and the site has gone from page 2 to page 5. All of the articles are still on the article sites and blogs, but google is ignoring them. Why does this happen and how to get rid of this in future.