I might have found out where the problem may be, or at least where it isn't. I decided to try out running the latest version of Koboldcpp standalone, and I used Nemo as the model to run everything through, and it did eventually have that random drama happen (power outage this time). I think the problem might not actually be entirely with Silverpine, though 1.4.1 did reduce the frequency. I think the problem is with Nemo, Koboldcpp, or with how my hardware interacts with everything in the stack. It's not super helpful, since I don't have anything really concrete, but it might at least mean that the problem isn't your fault this time.