Per email from aws:
EC2 has detected degradation of the underlying hardware hosting your Amazon EC2 instance (instance-ID: i-858d4a03) associated with your AWS account (AWS Account ID: 039289279626) in the us-east-1 region. Due to this degradation your instance could already be unreachable. We will stop your instance after 2020-01-17.
|Status||To Do [ 10001 ]||In Progress [ 3 ]|
|Resolution||Done [ 10000 ]|
|Status||In Progress [ 3 ]||Done [ 10002 ]|