The thing about the Saturn, or any electronics for that matter is that the voltage has to remain at the constant that it needs, or certain areas will not work as there is enough electricity, but not enough force to ensure an equal amount of power is distributed. Also did you replace your PSU with a similar one from Yamaha? Or did you use an aftermarket? I know these power supplies are in limited quantity so it is an issue. Some have resulted in replacing caps, or other methods. I love the Saturn, but I do wish they used an external power supply to avoid this problem.