I have two systems running HG and upgraded to r450 on both and now after some time they become unresponsive. I looked in the console and found a several exceptions occurring somewhat regularly and didn't see them mentioned in the forum search. No custom automation/scripts running on these instances. Restarting the HG service seems resolves it temporarily until it becomes unresponsive again. Might revert to r441 and see if that's more stable. Please look into these.
Too many open files
2014-12-28T14:59:39.9033940+10:30 HomeAutomation.HomeGenie.Automation NetHelper Error: ConnectFailure (Too many open files) Exception.StackTrace at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
at System.Net.HttpWebRequest.GetResponse () [0x00000] in <filename unknown>:0
at System.Net.WebClient.GetWebResponse (System.Net.WebRequest request) [0x00000] in <filename unknown>:0
at System.Net.WebClient.ReadAll (System.Net.WebRequest request, System.Object userToken) [0x00000] in <filename unknown>:0
at System.Net.WebClient.DownloadDataCore (System.Uri address, System.Object userToken) [0x00000] in <filename unknown>:0
Unable to open database file
2014-12-28T14:57:30.2468030+10:30 HomeAutomation.HomeGenie Service.StatisticsLogger Unable to open the database file
unable to open database file Exception.StackTrace at System.Data.SQLite.SQLite3.Reset (System.Data.SQLite.SQLiteStatement stmt) [0x00000] in <filename unknown>:0
at System.Data.SQLite.SQLite3.Step (System.Data.SQLite.SQLiteStatement stmt) [0x00000] in <filename unknown>:0
at System.Data.SQLite.SQLiteDataReader.NextResult () [0x00000] in <filename unknown>:0
at System.Data.SQLite.SQLiteDataReader..ctor (System.Data.SQLite.SQLiteCommand cmd, CommandBehavior behave) [0x00000] in <filename unknown>:0
at (wrapper remoting-invoke-with-check) System.Data.SQLite.SQLiteDataReader:.ctor (System.Data.SQLite.SQLiteCommand,System.Data.CommandBehavior)
at System.Data.SQLite.SQLiteCommand.ExecuteReader (CommandBehavior behavior) [0x00000] in <filename unknown>:0
at System.Data.SQLite.SQLiteCommand.ExecuteNonQuery () [0x00000] in <filename unknown>:0
at HomeGenie.Service.Logging.StatisticsLogger.logInterval_Elapsed (System.Object sender, System.Timers.ElapsedEventArgs eventArgs) [0x00000] in <filename unknown>:0
UPnP NullReference
2014-12-28T13:45:59.6753990+10:30 HomeAutomation.HomeGenie UnhandledExceptionTrapper System.NullReferenceException: Object reference not set to an instance of an object
at OpenSource.UPnP.MiniWebServer.Dispose () [0x00000] in <filename unknown>:0
at OpenSource.UPnP.MiniWebServer.Finalize () [0x00000] in <filename unknown>:0 HomeGenie.UnhandledException System.NullReferenceException: Object reference not set to an instance of an object
at OpenSource.UPnP.MiniWebServer.Dispose () [0x00000] in <filename unknown>:0
at OpenSource.UPnP.MiniWebServer.Finalize () [0x00000] in <filename unknown>:0