I've been working with one of our users who has been experiencing client disconnects ONLY when connected via Ethernet. This behavior is not present when the user is connected to WiFi. Looking at the server logs, I can see that the user successfully authenticates with the OpenVPN server and remains connected for close to two hours, but then randomly disconnects due to an authentication failure:
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Sep 12 11:33:18 openvpnSRV openvpn[1292459]: xx.xxx.xx.xxx:57205 TLS: Username/Password authentication succeeded for username 'USERNAME' #indicating initial successful connection to OpenVPN server
Sep 12 13:27:37 openvpnSRV openvpn[1292459]: AUTH-PAM: BACKGROUND: user 'USERNAME' failed to authenticate: Authentication failure
Sep 12 13:27:37 openvpnSRV openvpn[1292459]: xx.xxx.xx.xxx:52273 PLUGIN_CALL: POST /usr/lib64/openvpn/plugins/openvpn-plugin-auth-pam.so/PLUGIN_AUTH_USER_PASS_VERIFY status=1
Sep 12 13:27:37 openvpnSRV openvpn[1292459]: xx.xxx.xx.xxx:52273 PLUGIN_CALL: plugin function PLUGIN_AUTH_USER_PASS_VERIFY failed with status 1: /usr/lib64/openvpn/plugins/openvpn-plugin-auth-pam.so
Sep 12 13:27:37 openvpnSRV openvpn[1292459]: xx.xxx.xx.xxx:52273 TLS Auth Error: Auth Username/Password verification failed for peer