Not that model, but this week I had a WB-300-IP-3 more or less die on me. I set it up and it was on OvrC, then a few days later it showed up as disconnected. When I got over to check it out, it had power to it, but it wasn't putting out power and the Internet LED wasn't on.

I can only guess that maybe someone was goofing with breakers while it was doing an update. It doesn't show up in the utility. When I connect it to a switch, it'll show net activity for a few minutes, then blink out, come back on and repeat. I guess it's bricked, pretty much. Got to call it in on Monday.