'connection not initialized issue resolved after restart iis

My MVC web application crashes sometimes in live server while we are working on it. All users are facing [Exceptions]yellow error screen.

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This exception occurs on randomly not on specific location or specific click. But when I restart my application on IIS the application working fine. but again some hours same problem appears.

When I try to Re-login Then application don't respond. but after restart IIS. I successfully login in to application with same credentials.



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