i have a question. If your pages are being de-indexed does it mean you are in a sandbox?
If your pages are being de-indexed (as in they were once indexed by Google but now they're not), those pages are likely tripping a spam filter and being de-indexed for that.
Unfortunately, I'm all too familiar with this. I worked for a company that had done a bunch of black hat tactics to artificially rank websites, and ended up getting many of them de-indexed ... including their own website!! So whether I wanted to or not, I sort of become an expert at "spam removal" cleanup operations.
Here were the most common causes of those sites being de-indexed:
1. Mirror pages. I'm talking hundreds and hundreds of duplicate pages with keyword-rich file names, all linked to from a bogus site map.
2. Domain masking. URL said you were on page A, but all files were being framed in from site B.
In every case, the sites were reincluded by Google within 45 days of fixing these issues.
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Google's webmaster guidelines
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Hope that helps. Let me know if you need some more help regarding pages being de-indexed.