Every one or two days on 2 dnn applications same thing !!!
Hanging up, there are only available main page, all other links disapears and shows errors. After restarting everithing is workin fine one day!

Please how to resolve this problem, thank you !

AssemblyVersion: 04.08.00
PortalID: -1
PortalName:
UserID: -1
UserName:
ActiveTabID: -1
ActiveTabName:
RawURL: /Default.aspx
AbsoluteURL: /Default.aspx
AbsoluteURLReferrer:
UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322; InfoPath.2; .NET CLR 2.0.50727)
DefaultDataProvider: DotNetNuke.Data.SqlDataProvider, DotNetNuke.SqlDataProvider
ExceptionGUID: 884105ef-0376-491e-bf42-2a8df8986a5b
InnerException: Index was outside the bounds of the array.
FileName:
FileLineNumber: 0
FileColumnNumber: 0
Method: System.Collections.Generic.Dictionary`2.Insert
StackTrace:
Message: System.IndexOutOfRangeException: Index was outside the bounds of the array. at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) at DotNetNuke.Entities.Tabs.TabController.FillTabInfo(IDataReader dr, Boolean CheckForOpenDataReader, Boolean CheckForLegacyFields) at DotNetNuke.Entities.Tabs.TabController.FillTabInfoCollection(IDataReader dr, Boolean CheckForLegacyFields)
Source:
Server Name: WIN4

Please, how can i do that ?? You meen "clear cashe" from host settings?

Maybe is problem with IIS ?