Last week the network of the cluster was still misbehaving, and at the end of the week Patrick replaced the switch which was locking up. That resolved the issue. In the Calico network configuration I modified the IP_AUTODETECTION_METHOD which was the possible suspect, and the system responded that it is updated. The process recreated the Calico pod for that node, but not clear that it did the trick (could be something overrode the parameter), and at least id didn't resolve the connectivity issue for that Calico pod.