The only place I am getting the aforementioned error is when I unpublish a page.  Any page, doesn't matter which one.   I get the following below in umbracoLog.  Publishing works fine.  Only way I know to fix it is iisreset, which I do not like to do and error recurs in 24hrs or less.

Any assitance would be great.

At /umbraco/editContent.aspx?id=25189 (Referred by: http://mysitename.com/umbraco/editContent.aspx?id=25189): System.OutOfMemoryException: Exception of type 'System.OutOfMemoryException' was thrown.
   at System.String.GetStringForStringBuilder(String value, Int32 startIndex, Int32 length, Int32 capacity)
   at System.Text.StringBuilder.GetNewString(String currentString, Int32 requiredLength)
   at System.Text.StringBuilder.Append(String value)
   at System.IO.StringWriter.Write(String value)
   at System.Xml.XmlTextEncoder.WriteRawWithSurrogateChecking(String text)
   at System.Xml.XmlTextWriter.WriteCData(String text)
   at System.Xml.XmlCDataSection.WriteTo(XmlWriter w)
   at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
   at System.Xml.XmlElement.WriteTo(XmlWriter w)
   at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
   at System.Xml.XmlElement.WriteTo(XmlWriter w)
   at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
   at System.Xml.XmlElement.WriteTo(XmlWriter w)
   at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
   at System.Xml.XmlElement.WriteTo(XmlWriter w)
   at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
   at System.Xml.XmlElement.WriteTo(XmlWriter w)
   at System.Xml.XmlDocument.WriteContentTo(XmlWriter xw)
   at System.Xml.XmlDocument.WriteTo(XmlWriter w)
   at System.Xml.XmlNode.get_OuterXml()
   at umbraco.content.CloneXmlDoc(XmlDocument xmlDoc)
   at umbraco.content.ClearDocumentCache(Int32 documentId)
   at umbraco.library.UnPublishSingleNode(Int32 DocumentId)
   at umbraco.cms.presentation.editContent.UnPublishDo(Object sender, EventArgs e)
   at System.Web.UI.WebControls.Button.OnClick(EventArgs e)
   at System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
   at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)