Excessive data build-up can trigger issues in the platform like the one you're experiencing with your workflow in QuickBooks, pasa.
To fix this, I recommend clearing your browser's cache and cookies. This troubleshooting procedure helps the platform eliminate conflicts caused by the said browser components. If the problem persists, you can consider using another supported browser.
Alternatively, you can also delete the workflow in question to narrow down the result:
- Go to the Gear icon and select Manage workflows.
- Locate the workflow in question from the My workflows list.
- Click the dropdown arrow under the Action column.
- Choose Delete.

- Confirm the action by hitting Delete again.
- Recreate the workflow if needed, then toggle it Off.
For more comprehensive details on managing your workflows, you can review this article: Use workflows to automate your business processes.
If you have further questions, add a reply to this thread.