Incorrectly configured remote-box can cause VRRP stability issues along with high CPU utilization on CPM.
CPU on CPM reaching high levels and unstable VRRP leaves the unit in a very problematic state. Memory is also gradually consumed.
To explain this behavior.
All of the very serious symptoms described above have a single root cause. The remote-box was accidentally configured by the administrator in a way that instead of setting the IP of other chassis the IP actually points to itself. See the configuration example below (which corresponds with the logs above):