We have two pix 515e units configured as active and standby units. Whenever there is a power loss, both units come back online, but the standby unit won't pass traffic and is inaccessible from the console. The power LED is steady green, and the fan turns on, but it is simply unresponsive. The primary unit sees that the secondary unit is present (based on the "show failover" command), but it indicates that the standby unit has a status of "FAILED".
When I leave the standby unit unplugged for a longer period of time (I haven't timed it, so I don't know what the threshold is), then it responds normally - I can again access it from the console and it passes traffic.
Am I correct in assuming this is a defective unit and should be replaced, or is there some feature of failure that I don't know about that would cause this behavior?