Hi Sjaak,
It sounds like your connection to Betfair was congested or had temporarily failed. Are your refresh rate intervals too frequent? Check your API Refresh settings in Cymatic.
When the Status column says "FAILED", you should look at the Report column to see more details of the failure reason.
You can also go to the Cymatic main window and look in the Status Log tab, to see the details of any error messages that have been logged during the current session.
Regarding clearing the Status cells in Excel, you would need to choose the option "Clear status cells when selecting a different market", either in the window that opens the connection to Excel, or in the Excel button menus near the top of the Cymatic grid.
Kind regards,
Gavin