HA active/standby mode switching frequency

I am setting up HA Vault with Consul backend in a private kubernetes cluster.

For the PoC a cluster with 1 master and 3 workers is used. Consul is installed from the official HashiCorp helm chart and for the Vault I have created a custom one.

Everything works fine, however while inspecting Vault pod logs I see that approximately every 6 minutes active node is losing leadership:

[WARN] core: leadership lost, stopping active operation

Since both products Vault and Consul are new to me could you please advise whether that is an expected behaviour?

Thank you