Google is constantly checking and rechecking domains/sites against bot traffic, ie. russian spam, bot clicks, for their adword fraud checks. The inconsistencies you see are their "alleged" shutting down certain IP locations temporarily to run stat checks against "normal" traffic.
My law is this: "Rely on Google for your income, better have a day job". You can go crazy AND waste huge amounts of valuable time and effort trying to "figure" them out. The only thing that is true is this: Lots of pages with relevant content and a domain name that is identical to the search term. Get your standard
SEO boost ($29.95 at
http://www.EasyWebPages.net) and work on building content.
Even if you're blacklisted or sandboxed, if you find out why, make the proper adjustments to adhere to regs, in a few months you will be back in the system again. Don't fret or freak on Google placement. It's a waste of time. Focus on content and relevant keyword domains for your site. Build it, and they will come.