Amazon EC2 Dedicated Hosts now support automated maintenance on rare degradation

You now have the automated host maintenance feature available for your Amazon EC2 Dedicated Hosts. With automated host maintenance, in the rare event of degradation of a dedicated host, AWS will automatically reboot the EC2 instances running on it onto a newly allocated dedicated host during a scheduled maintenance event, to reduce your application’s downtime and offload undifferentiated heavy-lifting of host maintenance.

Source:: Amazon AWS