Session Time-out in customised Sharepoint 2010 application

Users are facing frequent session timeout error while accessing our customised Sharepoint 2010 application.

1.     We are using In-proc session state and have configured it for 30 minutes time-out in IIS Manager.

2.     Our preliminary analysis is that w3wp.exe is crashing due to below Error events which is affecting the sessions:

 

    a. Event ID : 1000

        Event Description:

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2

Faulting module name: OLEAUT32.dll, version: 6.1.7601.17676, time stamp: 0x4e587ee8

Exception code: 0x80000003

Fault offset: 0x0000000000001326

Faulting process id: 0x1014

Faulting application start time: 0x01cf16ba394fdc2d

Faulting application path: c:\windows\system32\inetsrv\w3wp.exe

Faulting module path: C:\Windows\system32\OLEAUT32.dll

Report Id: b8247927-82ae-11e3-a129-005056a51bb2

 

    b. Event ID : 1000

        Event Description:

Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x4ce7afa2

Faulting module name: ntdll.dll, version: 6.1.7601.18229, time stamp: 0x51fb164a

Exception code: 0xc0000374

Fault offset: 0x00000000000c4102

Faulting process id: 0x1564

Faulting application start time: 0x01cf16b845727e6d

Faulting application path: c:\windows\system32\inetsrv\w3wp.exe

Faulting module path: C:\Windows\SYSTEM32\ntdll.dll

Report Id: 7582fbe4-82ad-11e3-a129-005056a51bb2

 

What we have tried:

1.     Have run “sfc /scannow” to verify system file integrity

2.     Have tried setting legacyUnhandledExceptionPolicy enabled="true" in aspnet.config

 

Still, the w3wp.exe process is giving these error events.
Please help us if you have experienced and resolved such problems