Hi All, Thank you everyone for taking your time to respond on my query. This has been fixed, and it was identified that there were few clients in LAN which was keep sending IPv6 request to MX. The MX02 got overwhelmed due to this and unable to see VRRP from MX01, and assumes the MX01 isn't available and it started becoming master. After few seconds, it receives VRRP from MX01 and then it becomes standby. The event log doesn't show any IPv6 DHCP logs and Meraki TAC informed us that it is visible only in backend, and they suggested to block IPv6 in Switch ACL until we remove IPv6 on those clients.
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