ServUO has crashed with this:
System.ArgumentOutOfRangeException: Argument is out of range.
  at System.DateTime.op_Addition (DateTime d, TimeSpan t) [0x00000] in <filename unknown>:0 
  at Server.Timer.get_Next () [0x00000] in <filename unknown>:0 
  at Server.Items.DisguisePersistance.Serialize (Server.GenericWriter writer) [0x00000] in <filename unknown>:0 
  at Server.StandardSaveStrategy.SaveItems (Server.SaveMetrics metrics) [0x00000] in <filename unknown>:0 
  at Server.DualSaveStrategy+<Save>c__AnonStorey10.<>m__2F () [0x00000] in <filename unknown>:0 
  at System.Threading.Thread.StartInternal () [0x00000] in <filename unknown>:0
Can you please run the server in debug mode this will give a better idea of what is causing the crash..

To run in debug you need to

create a shortcut of servuo.exe (application)
Right click on shortcut to bring up menu.
Click on Shortcut tab (unless is started on it)
Where is says Start in (something like) C:\you\yourdirectory\servuo\servuo.exe
change this to C:\you\yourdirectory\servuo\servuo.exe -debug

This should if you can recreate the crash give you the location of the script that has caused the crash.