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In my opinion it's very important to always choose your page titles very carefully before you launch the page, and then leave them alone from then on.
I believe that suddenly changing the title of an old page is a big change, likely to be a red flag for google's algorithm that usually causes a temporary drop in rankings and trafficaristotle... what EG said, plus some further observations. Like you, I've come from a long history of paying meticulous attention to titles. I still think they matter, particularly on new sites, and on competitive terms, product pages, etc.
But most of my articles are doing pretty well, and I haven't touched them in years, and don't expect to.
This started happening around December 15th of last year.
joined:Oct 24, 2015
What is your best guess to what is attracting non-productive organic/adwards traffic?