Sorry to hear that. One of my 8Cs had a cabinet crack, and I heard a similar story from one other user. D&D replaced the entire pair and were, frankly, delightful to deal with during that process--vastly more professional and responsive than other, bigger companies, such as Devialet, have been in my limited experience.I had both of mine failing within a week of each other. Then a bunch over on gearslutz had the same happening to them. Some folks spread over different forums also experienced the same.
Most cases were related to some amplifier relay malfunctioning, but in every case you need to send them back to Holland. From what I was told, the problem was some manufacturing fault in a series of Hypex Ncore amplifiers, which could of course be true.