Hi, after new year all keywords on my company site is get better rank, than suddenly after 17.01. we lost our rankings, even worse some of our keywords are dropped. We continue with watching and situation get worse. In last two days two of keywords get better rank, but still now some of keywords are dropped. For sure google made some changes on this date, maybe after that 24.01. they make some update but still now they have issue with this. I hope so this is temporary and we will get back on our latest place with keywords.
I feel most of these answers are wrong. 10 pages is what's referred to as a "Google Hand Job". They, most likely, found your off-page strategies to be over optimized. If you have more than 20% of you money keywords pointing to an Exact Match sud-domain, they will penalize.. this goes above and beyond normal filters. Example: 100 links - 40 of them say "Buy Cheap Golf Clubs" All forty point to: Mydomain.com/sports/equipment/buy-cheap-golf-clubs/ This means you are "double dipping" the optimization and therefore, spamming the engines (whether white hat or not) Hope this helps!