Your questions would be best answered by Bryston -- call them, they're very nice. And, they will tell you if you need to send the amp in for service, or if you could fix it on your own.
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agree it needs a call to Bryston.
They have a fantastic warranty, so they certainly have built in protection circuitry to prevent major problems.
It's turning itself off before it explodes!(ha ha)
It may be a minor issue with the protection circuits, or a major fault!
With the warranty 20 years! I'd send it in.
(or is it more than 20 years old?)
Bryston tells me it's a "low-voltage power supply" problem.
I won't even try to fix that. Up to service in Vermont it is going. It's around 3 yr young. I guess this qualifies, given the duration of the Bryston warranty, as an infant mortality.
I doubt the "ST" versions were around 20 yr ago. But that circuit protection is a wonderful part of this particular problem. It certainly saved all the other gear in the system from amp-associated damage!!
Thank you all for your solid advice.