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@Troy Larimer: I already replaced the power supply board ($80) and it made no change. After replacing it, I got a real good look at the original and saw that none of the caps were bubbling. I'm moving on to the PCB board, because when it hangs I've identified a change in the little flashing lights on that board (no idea what the lights speficy, but one pair stops blinking green, and another one higher up turns red). Since that correllates to the problems, I'm giving that a shot (another $70). If it doesn't work, I'll re-sell the power supply and PCB board on eBay, get some of that money back, and call it quits.