Nhibernet Web App doesn't support multiple users

Question

 

 

We are useing Nhibernet MVC Artecture Code first approch in C# Asp.Net with Web API's,SQL Server as Backend Database System.

My Current Server Configuration is Windows Server 2016 with 16GB Ram 4Core processor and Hosted it on Microsft Azure.

Please Find attachd  Screeshoot
Application is throwing these Random errors and we are not able to pin point exect situation Need Some Guidance