A GA4 event stopped recording. How to find the day tracking broke
Before anyone changes a tag, find out when the event stopped. The date tells you which change to look at first.
The short answer
Find the last day the event looked normal in GA4, and check that visits didn't drop on the same day. Then line that date up against what changed on your site, in Tag Manager and in your consent setup. The change closest to that date is where the repair starts.
On this page
Find the day
The Events report shows how many times each event fired. I build a free form exploration with the date and the event name, so the daily count for one event sits in a single table, and look for the last day it looked normal.
Then I put sessions or page views for the same pages beside it. If visits fell on the same day, the event may be fine and the traffic changed. If visits held steady and the event dropped, tracking is the likely cause.
Two details can move the date by a day. GA4 reports dates in the property time zone, and recent days can still change, because processing can take 24 to 48 hours. To check whether the event is arriving right now, the Realtime report shows the last 30 minutes.
Line it up against what changed
With the date in hand, I check what changed around it.
- The site. A release, a redesign, a new form or a new checkout step.
- Tag Manager. The publish history shows which version went live and who published it. Who has access to your Tag Manager covers who could have made the change.
- The consent banner. A new banner, new categories or a settings change in your consent platform.
- The platforms. A change on Google's or Meta's side. The June 15, 2026 consent mode change is one example.
A case from audits
In one audit, a paused tag's events stopped on the date of its last edit. That explained a gap that looked like a tracking failure, and the date pointed straight at it.
Mark it so it's easier next time
GA4 lets you add annotations, notes on a report's chart for a single date or a date range. Add one for each release, Tag Manager publish and banner change, and keep a short change log beside the container. Next time a number moves, the likely cause is already on the chart.
Questions about finding when tracking broke
Why did my GA4 conversions drop to zero?
A key event drops to zero when it stops firing on the site or stops reaching GA4. Find the last normal day, then check what changed around it before editing any tags.
How far back can I look?
Standard reports keep their totals. Explorations depend on your data retention setting, which can limit them to recent months.
