Seems obvious enough, but the email quoted above came from Topping, not BrightAudio."This situation has been taken seriously by us, and we have collected several machines with similar problems for research, but there are no definite results yet.
However, don't worry, as a serious and responsible manufacturer, we will continue to do more tests and analysis until we find the root cause of the problem and solve it...
you don't have to send back the LA90D."
I really hope Topping figures this out soon as I was beginning to really love these amps before they failed.