I have two ASA5520 devices running version 8.2(2)16. They are in active/standby mode. This issue is not happening all the time but the devices are failing over and I have worked with Cisco TAC on this but was not able to uncover the issue. Under the "sho failover history" it shows reason of "HELLO not heard from mate". The Cisco tech had me upgrade IOS on both units and change out the cables on the management ports but no luck. I have sent the crash logs to the tech also but still no luck on find why this is happing sometime and when I say sometimes it may be once to twice a week that it happens. Has anyone seen this happen to them and have a case number that they worked on this with a tech or notes on how they uncovered why this is happening?