First of all, we would like to apologize you that problem happen again. For this case,we have reconfigured to advertise your prefix to Facebook Cache because we have solved the fabric drop on our core switch that caused the packet drop and high latency on our network. After received notification from your team, we have stopped announce your prefix to Facebook Cache and will simulate your case on our lab to analyze and find out the root of cause.
If you need more assistance, Please feel free to contact us.