I’ve had NAD BEE units, of various iterations, for 15 years, and never ONCE had an issue with them. In fact, I recommend them to friends, 4 of whom have had their units in their stereo systems for 6 or more years, and even now, nary a problem.
Certainly, it’s understandable why you feel as you do, but isn’t this a bit like being thrown off ONE American Quarter horse (the most docile and recommended for first-time/beginning riders) and vowing never to get one one again because the first AQ horse was a bad experience?
What happened with your NAD can happen with ANY amp, friend. Don’t lose yourself in the delusion that it can’t. I had two extremely expensive amps blow (not in the same way, but still - they BLEW!)
That said, given the PTSD you’re having, a different amp would be the most logical course of action.