I have just upgrade my website from 3.90 to 4.1. I am hosting it under VM in windows azure with good specs. My website shutting down from time to time and i have no idea why this is happning, i have to reset the IIS to make it work again.
I have many logs of "Reading the request body timed out due to data arriving too slowly. See MinRequestBodyDataRate." and "An existing connection was forcibly closed by the remote host".