Why A Sudden drop in SERP for just certain keywords

I just dropped off the face of Google after being in the top 3-4 pages consistently for over a year. This has not happened since my first 2 years. I still rank in same positions for hundreds of other valuable keywords. What would cause this?

 

Google as been integrating their new search engine called caffeine lately. Maybe it is the cause.

 

Check the page load speed. This has been integrated as a factor into google's ranking algorithm.

 

Do you update your content?

 

mabey ad more backlinks.

 

content updated regularly and links added daily - was in same positon for a year for my main keyword, then just vanished

 

this time google can update all the things like ranking, page rank and popularity so this time u take any type of effect so its call for google caffeine updation.

 

If it is the so called Caffeine update - what should be done?

 

Maybe you should
- Log out from google account
- Disable "Customization" in "Web History" found top right in Google search page.

 

Caffeine maybe in effect... so this is most probably the cause for it. We still can't confirm till more news were released by Google.

 

Same thing happened to my site: yesterday it was on 1st page for huge list of keywords, this morning completely disappeared, ranking for just just 2-3 keywords! (I posted about my problem, but I guess it was the wrong thread; sorry if repeats, but I really need to know what is going on!)