Has Google changed their rules?

I'm not sure, Because the changed is true at all.

 

go and ask google team..maybe they know something

 

Does your site rank in first position for its' domain name? Without the .com/.net /.info etc extension?

If the rank for your domain using this search is after 30 then you have a penalty, normally for link building techniques but can be for other reasons too.

I am only guessing here as there is not much info to go on.

 

I think many sites are experiencing this problem, lately I have noticed that my site has been
moving around quite a bit in the serp. I think these changes are temporary, hopefully things
will return to normal.

 

sure, just click on my signature.. if you need to examine it.

 

Used to be number 2 now not even in the top 100

 

check out my signature

 

Could you explain what you mean?

 

I agree, these perhaps the most reasons google algorithm dancing, just to make certain the quality of our content and backlinks. Again of course, SEO in details. Please, let's just focus on these thing.