'How can I find the reason why one of the Azure Web App instances stops responding to http requests?

We have a problem with an application hosted on Azure App Service Plan version P3V2. Depending on the traffic in our system, the App Service Plan is scaled up to 5 instances. During heavy traffic, one of the application instances stops responding to requests and after a few minutes it is restarted by the Auto Heal functions. We use Application Insights to monitor the application, unfortunately no logs are saved when there is a problem with the operation of this one instance, also in Event Log we do not see any logs that can help us.

Below I am sending a screen from last week showing all the situations when one of the instances stopped responding to requests.

enter image description here

We did not notice any jumps in the memory used in the application as well as the increased processor time.

I would be grateful for any suggestions or tips.

azureazure-web-app-serviceazure-app-service-plans


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