Azure Timer Functions stop working after a few days

> Please provide us with the following information:
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### OS and Browser
Mac Chrome

### Repro steps
> Create a timer triggered function app using visual studio, publish it to azure. Once published to Azure it runs for a few days and stops triggers or running the function all together, I don't see any logs for them either. (Timer triggered functions work whenever run locally. )

Or sometimes does not complete processes in the function. It happens randomly, it works at one instance and it doesn't the next.

### Any error messages
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### Mention any other details that might be useful.
My function app is a timer trigger run everyday at midnight. It copies data from a source container to a destination container using the methods from the Microsoft.WindowsAzure.Storage.DataMovement package to copy the data.

The report names no repository file, test, or host entry point. Start by comparing the Azure-published timer-triggered function with its local run, focusing on the missing logs, stopped triggers, and incomplete storage copy process. Done means identifying a reproducible cause and verifying a fix or documented workaround.

Written by the indexing model from the issue text.