Google SEO/traffic weirdness
 

I've got a site that used to get ~3-4K visitors daily from Google, then experienced a big drop in March 2012, and another in November 2012. It's continued to slowly decline since then, I'm now down to about 300/day. Never got any notifications about manual penalties. I assume it's the Panda/Penguin updates that are killing me.

Now the weird part - about once every few months, my Google traffic will suddenly double in one day, but it only lasts another 1-2 days before dropping right back down just as quickly. I'm wondering if this kind of pattern is typical, or if it might be an indicator of particular SEO problems with my site. Any ideas?

ill bet made it to their list and are flagged adult webmaster ,
even when ur not blackhat spamming

thats just an indicator that u leave on those domains/probably ips

and move on to the next domain/ip , fake registrar info , just using the same idea/content with small modifications...could bring u back until your again
beeing flagged in their system
rinse and repeat

Do you have any DC on your website ?

Good
 

I have the same iusses, what is DC ?

duplicate content