I'm on my third set of Diode dynamics and on both the fronts half of the upper segments are dead. Keep your receipt as you'll need it as they ask for an invoice, buy the eBay ones you can get three or four sets for what the DD cost, that and you won't have to ship them back, just pop in a replacement.
https://www.ebay.com/itm/For-16-20-C...Cclp%3A2334524