In our environment we have 6 node, there are 2 batch node and 4 app node. The problem is face when we up one of app node that some of queue processor is not running, but when the problematic node is not started the all the queue processor is running well.
@AndiK168 Your nodes could be leaving the cluster. I know there is haslecast issue that Pega is aware of, but that might be Kubernetes specific. Some nodes leave the cluster, and make a separate cluster of a single node. Best to contact pega support.