This is a seo nature up down of the website on SERP so any logic in your mind to then please share urgent. and what should do quickly.
Well, have you done anything to the site recently? new links? Changed layout?
Have the same problem on my website Restaurant software india. Sometimes 2nd page suddenly dropped into 4th page...
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I also face this problem several times when running on my web at trustorereview.com. What I can do is to contact to my hosting provider. What a reply.... they solved it quick but also suggest to upgrade the space
I face this problem while i m just opening my site on my web at http://www.cadoutsourcing.net. I just contact hosting provider and It replied very nicely and the problem is solved.