If you redeploy the function it'll terminate all existing containers. It could be as simple as assigning the current date/time to the description of the Lambda function and redeploying. This will allow you to redeploy as many times as you need because something is unique and it will tear down all existing containers each time you do the deployment.
With that said, Lambda functions are supposed to be stateless. You should keep that in mind when you write your code (eg. avoid using global variables, use random file names if creating something temp, etc). From the sounds of things, I think you might have an issue with your design if you require the Lambda container to be torn down.
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