The website I am working on has a lot of news and much more content. We had the site since around 2010 and index was gradually growing up-to 350,000 pages. After 2016-08-15 we are losing indexed pages rapidly and now it is around 150,000 pages. (On 2016-10-25)
Note : We did not change Sitemap, Robot.txt in any way and we did not encountered any index drops before. The dropping is stabilizing now.
We identified following issues in our website.
- We have meta keywords tags which can be marked as keyword stuffed tags.
- Most of our pages are not responsive and not mobile friendly.
- Google index status graph shows one removed page after the above date.
We did not receive any manual action notifications or warning notifications from google.
Could someone please clarify what could have caused this issue? Is it possible google decided to de-index pages based on above listed issues or on one of their algorithm update or a penalty?
Update : I am not a SEO expert. I am a front end developer who just noticed this.