Getting hostingenvironment shutdown message in ASP.NET

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IIS-Express

Hi I have an ASP.net site
Every day this error causes me to have to restart IIS.

_shutDownMessage=HostingEnvironment initiated shutdown HostingEnvironment caused shutdown

_shutDownStack= at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
at System.Environment.get_StackTrace() at System.Web.Hosting.HostingEnvironment.InitiateShutdownInternal()
at System.Web.Hosting.HostingEnvironment.InitiateShutdownWithoutDemand() at
S ystem.Web.Hosting.PipelineRuntime.StopProcessing()

I appreciate if anybody can help me

Looking forwad to seeing your guidness
Daryush

What I have tried:

I did a Google search for various forms of EES, especially its cycle adjustment and advanced settings, but did not find the answer.