In general, this is usually due to an LED with an incomplete solder joint or a defective LED. This may be fixed by either re-soldering the LED or replacing it with a new one.
If you would like to discuss this in greater detail, please email
technicalsupport@deckkeyboards.com .
If you would like to return your Deck for repairs, please see
http://www.deckkeyboards.com/returns.php .