Operation is not valid due to the current state of the object

Hi,

We are getting below error in ULS logs intermittently when accessing the SharePoint webappliction

Please advise.

Entering monitored scope (Request (POST:http://Contoso:80/SitePages/Reports.aspx)) 
Logging Correlation Data       xmnvMedium  Name=Request (POST:http://Contoso:80/SitePages/Reports.aspx)42afb487-4f03-4d55-a4ad-a52d5bdc2dca
Runtime                      tkauUnexpectedSystem.InvalidOperationException: Operation is not valid due to the current state of the object.    at System.Web.HttpRequest.FillInFormCollection()     at System.Web.HttpRequest.get_Form()     at Microsoft.SharePoint.SPGlobal.GetParametersFromHttpRequest(SPSite site, Boolean bAuthenticated)     at Microsoft.SharePoint.SPGlobal.CreateSPRequestAndSetIdentity(SPSite site, String name, Boolean bNotGlobalAdminCode, String strUrl, Boolean bNotAddToContext, Byte[] UserToken, String userName, Boolean bIgnoreTokenTimeout, Boolean bAsAnonymous)     at Microsoft.SharePoint.SPWeb.InitializeSPRequest()     at Microsoft.SharePoint.WebControls.SPControl.EnsureSPWebRequest(SPWeb web)     at Microsoft.SharePoint.WebControls.SPControl.SPWebEnsureSPControl(HttpContext context)     at Microsoft.SharePoint.Ap...42afb487-4f03-4d55-a4ad-a52d5bdc2dca
Runtime                      tkauUnexpected...plicationRuntime.SPRequestModule.GetContextWeb(HttpContext context)     at Microsoft.SharePoint.ApplicationRuntime.SPRequestModule.PostResolveRequestCacheHandler(Object oSender, EventArgs ea)     at System.Web.HttpApplication.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)42afb487-4f03-4d55-a4ad-a52d5bdc2dca
Medium  Leaving Monitored Scope (Request (POST:http://Contoso:80/SitePages/Reports.aspx)). Execution Time=38.02159212972642afb487-4f03-4d55-a4ad-a52d5bdc2dca