Latency in accessing Consul when one node goes down in HA setup

I am using Vault with Consul as storage backend on kubernetes cluster. I am testing a scenario, what happens when one node goes down out of 3.

1 Master 2 worker

Expected outcome:
Access consul UI without any delay.

Actual outcome:
It takes more than 30 seconds for consul UI to open and for response of every read request.

kubernetes version- 1.21
ubuntu- 20.04
consul- 1.11.2
Vault- 1.9.3