The voltages seem to be a pretty steady 4.94v and 25v at the fuse. I've tried it with the sub disconnected, or with the volume turned almost off, and it still behaves the same. It's strange, as just booting up, the pinsound plays the startup chime, then interrupts it, and plays it a second time... then the first time I hit start, or even just press the volume button, the chime plays yet again... I've swapped it for another pinsound board and they both consistently behave this way.
I am wondering if the recommend USB might be too slow. I've tried swapping it with a different of the same type - both are quite hot when I pull them out. I'm wondering if there's too much data in the sound package, and its causing the USB to malfunction, leading to a crash. I ordered a Samsung 150MB/s, which is a bit faster, to see if that has any affect.
It will do an hour long conversion just fine, with no resets or anything... as soon as it tries to play the Doctor in the Tardis though, kaboom.