NodePort Port changes every 20 seconds when exposeType to NodePort and enabled set to true

Tried creating MongoDB instance by exposing replicaset as NodePort, enabled to true , getting the below error in the operator log(attached CR as well as log file) .

replica set pods are getting restarted 

Percona Mongo K8s Operator Version: v1.8.0 as well as v1.9.0

Kubernetes verison: v1.19.7

Error:

{"level":"error","ts":1625676016.0854595,"logger":"controller_psmdb","msg":"failed to reconcile cluster","Request.Namespace":"psmdb-test","Request.Name":"test","replset":"rs0","error":"dial:: failed to ping mongo: context deadline exceeded","errorVerbose":"failed to ping mongo: context deadline exceeded\ngithub.com/percona/percona-server-mongodb-operator/pkg/psmdb/mongo.Dial\n\t/go/src/github.com/percona/percona-server-mongodb-operator/pkg/psmdb/mongo/mongo.go:61\ngithub.com/percona/percona-server-mongodb-operator/pkg/controller/perconaservermongodb.(*ReconcilePerconaServerMongoDB).