I have recently moved my site to another host with dns changes, now after only a few days i have noticed a dramatic change of my google-search traffic in which it is almost %30 less, is there any negative side of changing dsn/host with google search engine ?
I don't think so. I guess some of your normal visitors (from google) still find your site in google. However, because of late update of dns machines, they can't reach your site for some time..