Nodes Turned Themselves Off For No Reason. Now Suspended? What Do I Do?

[Alexey]

Do they were offline or did not have ingress?
We have some reports about stopping an ingress out of blue:

Suddenly no more ingress

What could be the reason: Node is not suspended, disk has space available, node has space available. But logs only show egress. After a stop and remove cycle the node immediately sees ingress again. What is wrong?