The situation isn't as simple as "have you checked if the GA tag is installed?".
Here's what I got:
- a main WP install on /blog/
- a second WP install on /blog2/ (not actually named blog2, of course).
Both have GA installed properly and has worked for years.
Starting the last week, on blog2 the traffic seemed to disappear in GA: http://prntscr.com/ufyug2
On /blog/ everything looks good, though.
GA is installed correctly and I checked it manually, with two Chrome extensions.
I didn't get dropped from Google SERP either. My posts are exactly where they were 2 weeks ago.
Google Console shows no change. Screenshot of a random article from blog2: http://prntscr.com/ufyv9b
I even disabled JS and HTML minification from W3 total cache, in case there was a conflict somehow.
Aaaand still no change.
Do you guys have any idea what could cause this?