I can help you fix the mileage tracking in your QuickBooks Online (QBO).
Uninstalling the app is one of the troubleshooting we can do if the mileage tracker stops working. Also, have you tried checking the settings on your phone to match the requirements for mileage tracking? If not, check this article under Step 3. If everything's good we can proceed to the following steps: Fix mileage tracking issues in QBO.
However, if the same thing happens, I'd recommend getting in touch with our Customer Support Team. They have the tools to check your account securely and help you work with your mileage tracker smoothly.
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