How to fix ""Error: {"message":"Failed to fetch","stack":"TypeError: Failed to fetch\n at https://portal.azure.com/Content/Dynamic/XXXXXXX","isError":true}

Everyday we develop our app using App Service. It works fine till the evening. In the evening we start getting this error: "Error: {"message":"Failed to fetch","stack":"TypeError: Failed to fetch\n ". Next day it starts working again.

After searching for this error, all forums say that this is a throttling issue. But we are just developing our app. We might be making less than 100 calls to our APIs. We are running on S1 plan. How can it throttle for such low loads?

We tried migrating from S1 to S2. But still no relief. How can we fix this issue?