Import mapping is no longer being saved

Import mapping is no longer being saved

Over the last week I have been having a problem when importing my daily leads from an Excel spreadsheet.  Every time I want to import the file I have to remap all of the fields.  I have never had to do this in the past.  Zoho tech support has been unable to give me an answer as to why this has started to happen.  Is anyone else having this issue, or does anyone have any ideas?  Thanks!