This evening, my entire Vivaldi stack (DAC, Upsampler, and Clock) shut itself down for no apparent reason. There was no power loss in the house, and nothing else in my system shut down. There was no event recorded on the Torus power conditioner. Everything else remained operational. But all three units shut themselves down at the same time. Their power sockets on the Torus remain fully operational.
When I restarted using front panel controls, all three briefly started but shut down as soon as the main screen became visible. I turned off all three units for 1m using the rear power switch. After restarting them, the DAC and Upsampler appear to be operating normally, and each is controllable in Mosaic. The DAC, however, does seem to go into a “standby” or sleep” mode; it can be awakened by pressing the Menu button when it does; but it has also shut itself off several times. When it does this, the Upsampler keeps playing. However, the Clock simply will not stay operational. This behavior occurs whether the Clock is connected to the SRS reference clock or not. All three units are cool to the touch. All IC. BNC, and power cables are firmly seated.