Use basic ip address with load balancer. You can also test it with ClusterIP, and use kube proxy to access it. Also check your deployment - if manager and controller are not restarting.
Section for manager in values for helm
manager:
enabled: true
resources:
limits:
cpu: 250m
memory: 1000Mi
requests:
cpu: 250m
memory: 250Mi
svc: # web ui
type: ClusterIP
next you use this
kubectl port-forward services/neuvector-service-webui 8443:8443 -n neuvector