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On September 28th, 2013 I saw my indexation rate decrease on my XML sitemap that I've submitted through GWT. I've since scraped my sitemap and removed all 404, 400 errors (which only made up ~5% of the entire sitemap).

Any idea why Google randomly started indexing less of my XML sitemap on that date? I updated my sitemap 2 week before that date and had an indexation rate of ~85% - no I'm below 35%.

Thoughts, idea, experiences?

Thanks!

It makes sense to me that Google wouldn't want a rich result above the fold in a SERP that would compete with their PLA's. All my videos are on my product pages, so the queries that produce them always have PLAs in the SERPs. I've been run a few tests on this and it seems as though these snippets keep my result below the fold on the SERP (position 5-10).

Thoughts on this? Experience?