Today (2015-03-24) at ~09:30 UTC, we lost asw-c4. At 09:47 I hit "enter" on the console server and the switch emitted "Rebooting...", rebooted itself and ultimately came back up online.
This is exactly the same symptom on the exact same switch as Incident-20141130-eqiad-C4, so this starts to look like too much of a coincidence and possibly a hardware fault.
We should investigate further and possibly replace the switch.