Traffic Group Properties

Was the problem ever identified? I just saw this behavior with Viprion 2100 blades, 11.5.1 HF7. One of the units had failed during an attempted upgrade to 11.6.0, and when I brought up the RMA I found config sync worked fine but traffic groups were a complete mess. The new unit took over as active but was showing "Initializing / Not Synced". The standby reported the expected status, but if I modified the traffic groups, it would drop its network connections several times before finally stabilizing after a few minutes.