Homepage de indexed

Does anyone know why my homepage gets time to time de indexed ? if I type site:mysitedomain sometime doesn't show up , and sometime does , but only the homepage , the other pages are fine .

But if I search on google "my site name" it's first result in serps .

I checked on Console but no crawls errors or anything like that ...

I experienced same issue.
My site is still ranking.
Maybe this is the reason: http://www.blackhatworld.com/seo/google-algo-update-today.874584/

So long as you rank for your brand name, it should not worry you. I think the site: is not reliable these days, and that may be for a purpose.

I'm experiencing exactly the same issues with one of our domains at the moment. Especially inner pages. Can you check GWT and see how many
of your total pages are indexed and if there's a decline, which date did it start?