Guys, I'm having a strange issue that I could use some help with. The homepage for a site that I work on was completely deindexed as of the 3rd/4th August. It doesn't appear for any of the searches that it used to and doesn't appear for a 'site:'search. Other pages on the site are fine. The homepage has not been noindexed using meta robots tag or robots.txt. In fact, we hadn't really touched the site for a few weeks before this happened. There is no manual penalty message in Search Console and, as far as I can see, those dates don't coincide with any known algorithm updates which might have caused an algorithmic penalty. One interesting thing which maybe related; We had a one page site we were using for Adwords which was always noindexed as it was purely an Adwords landing page. However, a little while back we 301 redirected this server side to the main site homepage. Despite being redirected, this landing page now appears for a 'site:' search for its domain, showing the meta title and description of the main site homepage. I'm not sure why it has now been indexed... The only other thing that I think could be an issue is we had ads for this site from a network that we own, of around 30 sites. These ads had a lot of followed links to the main site homepage - but this had been the case for ages. When we noticed that the homepage had been deindexed we made these nofollow. It's been two weeks since we noticed the drop and started trying to solve the issue, but no joy so far and I'm starting to run a little bit out of ideas. Anyone got any suggestions??