So I'm fairly new to the SEO small niche game, but I've been building things very quickly and so far everything has been running smoothly. But recently I had about 30 sites de-indexed at once (30 out of around 4000). All of my sites are in groups of 200ish so they aren't connected. I'm not sure what the de-indexing means or if it will come back. Does "being sandboxed" mean your site is de-indexed? I am very cautious with link building, these sites have not been pushed super hard and I've linked mainly to them with spun article promotion, social bookmarking, a few profiles, and a few social networks, around 15-80 links per month. All of the sites have decent and original content. I did have an issue with some of the sites loading blank content for like 12 hours- do you think that could have caused the de-indexing? I also had recently added some auto content on other pages of my site, but the entire thing was de-indexed (not showing up when I google site:xxxxx). It's been about a week so far, is this something I should worry about, or do you think my sites will bounce back after awhile if I keep linking? I'm not sure what to do. Please help!