Copy To Clipboard - Max Length?

I am using some vba code (see below) to put some data into the clipboard for pasting elsewhere.But it seems to fail sometimes, I think it fails when the data is too long.Is there a maximum?

The code below fails on the stmt, "DoCmd.RunCommand acCmdCopy" No specific error msg, just the dreaded "Microsoft Access Must Close...."It seems to happen when the length of the textbox is over 1000 characters.I tried inserting some DoEvents statements, but it made no difference.

Private Sub btnCopy_Click()
Dim rst As DAO.Recordset
Set rst = CurrentDb.OpenRecordset("tblLogs", dbOpenDynaset, dbSeeChanges)
If rst.RecordCount = 0 Then
rst.Close
Set rst = Nothing

[code]....