ASP.net Website get down some times- using threadpool,tasks,Parellel Foreach and System.Net.WebRequest/Response

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IIS7

ASP.NET

IIS

threads

.NET4

Hi to everyone,
i have deployed asp.net website with iis7, now problem is that the site become stop or not ope ratable some times randomly. and when i track the iis log i found some warnings and errors as listed below. before that i am list the errors in log i want to say that i am using threadpool, tasks ,Parellel Foreach and System.Net.WebRequest/System.Net.Response.

1)
Event ID: 5013
Description:
A process serving application pool 'ASP.NET v4.0 Classic' exceeded time limits during shut down. The process id was '4112'.

2)
Event ID: 5138
Description:
A worker process '4112' serving application pool 'ASP.NET v4.0 Classic' failed to stop a listener channel for protocol 'http' in the allotted time. The data field contains the error number.

3)
Event ID: 5186
Description:
A worker process with process id of '4356' serving application pool 'DefaultAppPool' was shutdown due to inactivity. Application Pool timeout configuration was set to 20 minutes. A new worker process will be started when needed.

4)
Event ID: 5013
Description:
A process serving application pool 'ASP.NET v4.0 Classic' exceeded time limits during shut down. The process id was '6068'.

5)
Event ID: 2262
Description:
ISAPI 'C:\Windows\Microsoft.NET\Framework64\v4.0.30319\ reported itself as unhealthy for the following reason: 'Deadlock detected'.

this warnings and error logged in iis frequently. I am using IIS7 and windows server 2008

Please help..