Primary keyword dropped

My primary keyword was dropped from page 1 to page 11 ,
I do less changes( including in site and out site) to my site this days .
what the problem is .?

 

give us more details on this one. keyword and the url. thanks

 

There can be any number of possible reasons. Probably it is just a Google Dance, meaning you would regain your ranking in a few days or weeks, or there may be more competitors for this keyword who have sprung up.

 

that is why I asked for more details to simply isolate those number of possibilities...

 

I agree it's probably just the big G dance, how old is your site though?

 

Yes, it just the big google dance , my site came to page 1 again .
it is a old site with primary keyword "camcorder battery" on page 1 of google SERP this years .

 

Fluctuation is normal. Compair you site against those above you.