Thanks for your response. I do not have access to Radius server log. But will propose this to the team who owns it. So in a typical environment we expect to see 0% authentication issues and 0% DHCP issues unlike association issues which can be present just because the client tried to connect two APs at the same time and then chose one ?
The authentication issues should have a quite small number but are not typically 0%. The authentication exchange could fail because of roaming away, packet loss, or other problems while authenticating.