Is Google DeIndexing my backlinks?

I created thousands of backlinks to my site over the course of a year, then took a break for a few months. Those backlinks seemed to be indexed and remain steady during that time.

Then a few months ago i started again to create more backlinks. Not only did those get "removed" but now it looks like my old backlinks were deindexed too. What's going on?

Here's a screenshot from Ahrefs. You can see the big spike (red dotted line) of Lost Backlinks, which only began after i restarted my campaigns.



Here's one of my main pages. You can see how the # of backlinks was steady then suddenly dropped from 1,400 to just 148.



EDIT:
Also i've seen a pretty steady drop in my page impressions over that time. 90,000 per day to now only 15,000

Google did some updated at the start of March and most people myself included lost a lot of links. Also some sites will have expired etc so the links have gone anyway. Find some threads about the update at the start of March

Ok i read a few posts:
http://www.blackhatworld.com/blackhat-seo/black-hat-seo/562977-algo-update.html
http://www.blackhatworld.com/blackh...indexed-didnt-even-build-any-links-still.html

But nobody is really talking about losing backlinks, just that some of their pages are dropping in the SERPs. It seems like people are guessing on things like Panda updates.

My problem has been a steady drop for 4 months. I always thought that when Google updates their algorithm it's a sudden drop in rank.

Does anyone else have an idea?

According to Google Webmaster Tools i still have the same # of backlinks, but AHrefs shows a huge drop.

And i've gone from that 90,000 page impressions to now only around 6,000.

Firstly yes - google does decide now and again to ignore backlinks (it ignore 80% no matter what you do to them. not the same as "doesn't know they exist" it does know they exist - it just chooses to ignore them)

However - many backlinks are transient for 2 very common reasons.

1) Creating gazillions of spammy links. Google might have deindexed the sites they were on as they were full of spam (your and everyone elses). More permanent - the webmaster sees that the links he's allowed have destroyed his site (stupid twat for letting people spam him really) so decides to cut his losses and closes the site.

Wordpress.com close 1.2 MILLION hosted blogs a month
The various WIKI platforms (open source) have dropeed from an estimated 850,000 in min 2011 to 100,000 now. Over 70% of them closed due to the same reason (got full of spam, Google slapped them - webmaster gave up)

2) Some links are transient by nature. Bookmarks, any other social links. They slip down the canonical structure of the site they are on over time to less and less relevant pages and eventually get archived or deleted.

3) Google just likes to clean up. Better to do it - than slap you eh

Scritty

I may well be stating the obvious here, but ahrefs and google are not the same thing. They have entirely different indexes, so what ahrefs shows as lost links is nothing to do with what google sees and ahrefs' index is only a fraction of the size of googles.

But yeah, Link decay is natural.

Ok thanks. I was just surprised by the sudden drop off. I guess I'll just have to start creating better backlinks. Maybe I'll try linking to some blogspot blogs, google might be less likely to drop them.