I have a workflow processing incoming mails (Gmail trigger). It ran reliably for some time, however for the past week it hasnt processed any mails.
This morning I deactivated / reactivated the workflow and it batch processed the mails from the last week. No errors were logged in the previous executions and the auth are up to date.
What could be the cause? For me the main issue is that the failure was silent and I just noticed it because i didnt receive any output in my mailbox.
This is a common issue with Gmail triggers where the webhook connection can become stale without showing errors. The fact that reactivating the workflow processed the backlog confirms this was likely a webhook connectivity issue rather than authentication problems.
To prevent this silent failure in the future, I recommend:
• Set up an **Error Workflow** using the Error Trigger node to get notified when workflows fail
• Create a **monitoring workflow** that runs daily to check if your main workflow has executed recently - if not, it can alert you
• Consider adding a **heartbeat mechanism** - have your workflow send a daily “I’m alive” message so you know it’s running
You can find similar cases and solutions in the [community.n8n.io]( No workflows are working in Active mode ) forums where other users experienced webhook triggers stopping without errors. The key is building proactive monitoring rather than relying on error logs alone.