I'm seeing issues in 2a but not 2b. Anyone having issues in 2b?
You'll need to see which availability zone ID (e.g., use2-az3) corresponds to each zone in your account: https://aws.amazon.com/premiumsupport/knowledge-center/vpc-m...
edit: AWS identified this as a power loss in a single zone, use2-az1.
And if I would have read the page the link points to better, that's exactly the reason
Physical identifiers for availability zones are like "use2-az1", ref.
https://docs.aws.amazon.com/ram/latest/userguide/working-wit...
https://docs.aws.amazon.com/prescriptive-guidance/latest/pat...