Not really sure what is going on at the minute, but basically 1 of my sites got pretty much has been wiped out overnight, pretty much all of it. Now, it's a site in the UK sports betting sector, showing free bets and sportsbook reviews, that's all I'll say on that. I've been in this sector for ages (over 15 years) so watched it change and learnt with it, and I know it's a tough market. Let's say the site is targeting 'red widgets' as the main Hollywood keyword, with variations such as 'UK red widgets' etc. Each sportsbook then has their own review which are well over 1600 words each, fully researched etc and honest. The main keyword would be '[generic] red widget', with many pages ranking on page 1, for their terms.
For the homepage, and like I said, I know it's competitive, for a year I've floating between page 1 and 2 for UK variations and other long tails and came and went regular out of the index for main 'red widgets' keyword and usually hung around about page 7-9, which I wasn't bothered about as unlike most of the sites in that field, I don't bother buying links.
Now I've said all that, roll forward to this morning, wake up to find the site isn't ranking for anything, all keywords, and longtails completely gone, check the individual pages, gone as well, yesterday 1 page was in 4th spot on page 1, not anywhere in the first 12 pages now. Strangely though, the 'red widgets' rank is still there on page 8 where it was yesterday, the only result I can find in the SERPS. I've checked search console, and there is nothing in there, googled site:xxxxxxx and the results still show everything indexed for now. So all is very very strange to say the least.
I'm hoping this is just a glitch but I've had 2 strange incidents since the last core update so I'm questioning if there is something really leftfield going on. 1 of my theories is that google struggles to differentiate between my site which is red-widgets and another with is redwidgets. Sounds strange but for a long while, especially when my site was new, google often listed us like 1 was a sub of the other, although mine is quality written and the other is heavily on the content spam side and google struggles to tell the difference until both sites have been crawled with a new update. That is just 1 theory though and might be total nonsense. It could be a glitch, or just what happens with these roll outs
I'll keep you posted though if it helps people