Since upgrading Concourse to 3.0.1 & now 3.1.1, we started seeing many unknown handle errors, across all pipelines, in both AWS & vSphere:

We have re-created the workers, the errors are not going away. Is this a known bug? What else can we try?

• Concourse version: 3.1.1
• Deployment type: BOSH
• Infrastructure/IaaS: same issues across 2 independent Concourse deployments, vSphere & AWS
• Did this used to work? Yes