We have suddenly started getting random YSOD.  They are very random and I can't reproduce the behaviour.  Getting lots of what looks like Umbraco/Node/SQl errors.  See a couple of stack traces below.

System.IndexOutOfRangeException: uniqueID
Generated: Wed, 06 Jul 2011 05:01:57 GMT
System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IndexOutOfRangeException: uniqueID
   at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
   at umbraco.DataLayer.RecordsReaderAdapter`1.GetOrdinal(String fieldName)
   at umbraco.DataLayer.RecordsReaderAdapter`1.IsNull(String fieldName)
   at umbraco.cms.businesslogic.CMSNode.PopulateCMSNodeFromReader(IRecordsReader dr)
   at umbraco.cms.businesslogic.CMSNode.setupNode()
   at umbraco.cms.businesslogic.web.Document.setupNode()
   at umbraco.cms.businesslogic.CMSNode..ctor(Int32 Id)
   at umbraco.cms.businesslogic.Content..ctor(Int32 id)
   at umbraco.cms.businesslogic.web.Document..ctor(Int32 id)

System.IndexOutOfRangeException: versionId
Generated: Wed, 06 Jul 2011 05:05:51 GMT
System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IndexOutOfRangeException: versionId
   at System.Data.SqlClient.SqlDataReader.GetOrdinal(String name)
   at umbraco.DataLayer.RecordsReaderAdapter`1.GetOrdinal(String fieldName)
   at umbraco.DataLayer.RecordsReaderAdapter`1.GetGuid(String fieldName)
   at umbraco.cms.businesslogic.Content.get_Version()
   at umbraco.cms.businesslogic.web.Document.setupNode()

System.ArgumentException: No node exists with id '1209'
Generated: Wed, 06 Jul 2011 05:07:54 GMT
System.Web.HttpUnhandledException (0x80004005): Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ArgumentException: No node exists with id '1209'
   at umbraco.cms.businesslogic.CMSNode.setupNode()
   at umbraco.cms.businesslogic.web.Document.setupNode()
   at umbraco.cms.businesslogic.CMSNode..ctor(Int32 Id)
   at umbraco.cms.businesslogic.Content..ctor(Int32 id)
   at umbraco.cms.businesslogic.web.Document..ctor(Int32 id)

A node with nodeid 1209 does exist.  I have tried publishing node.  Also a full republish..