I have a PR4100, and usually when I hibernate from the web interface or press the power button, the LCD display shows something like “Shutting down…” and then powers down as expected. But sometimes the screen immediately goes blank (still on/backlit), the server disappears from the network, and it sits that way indefinitely. What might be going on? Are there any logs that might clue me in?
P.S. If I hold the power button for 5 seconds afterward it will force a power down.