I think this problem appeared in some recent versions of ROS.
It definitely exists on 6.35.4 and 6.38.1.
When we have network outages, some PPPoE sessions are disconnecting with 'peer not responding' errors.
In this moments CCR CPUs are 100% utilised, so than router almost stop passing any traffic.
This can continue for some minutes. Router looses OSPF neighbors, and it's all becomes a catastrophe!
It number of disconnecting sessions is over 200-300 it collapses 100%.
Seeing this on several different CCRs.
I have de same Problem In CCR1072 V6.43.8