L2TP connection not stable. (AC68U)

[SHAH]

Im using HMA VPN service and my L2TP connection isn't stable. it gets disconnect after every 5 to 6 hrs. I dont know whats wrong with the connection. :/

Can anyone help me with this problem ?

Apr 23 08:07:00 rc_service: ntp 650:notify_rc restart_upnp
Apr 23 08:07:00 rc_service: ntp 650:notify_rc restart_diskmon
Apr 23 08:07:00 rc_service: waitting "restart_upnp" via ntp ...
Apr 23 08:07:00 miniupnpd[646]: received signal 15, good-bye
Apr 23 08:07:00 miniupnpd[659]: HTTP listening on port 35310
Apr 23 08:07:00 miniupnpd[659]: Listening for NAT-PMP traffic on port 5351
Apr 23 08:07:02 disk monitor: be idle
Apr 23 08:38:20 miniupnpd[659]: sendto(udp): Operation not permitted
Apr 23 09:42:41 miniupnpd[659]: sendto(udp): Operation not permitted
Apr 23 15:10:05 syslogd started: BusyBox v1.17.4
Apr 23 15:10:05 RT-AC68U: start httpd
Apr 23 15:10:05 kernel: klogd started: BusyBox v1.17.4 (2014-04-02 19:02:16 CST)
Apr 23 15:10:05 start_nat_rules: apply the nat_rules(/tmp/nat_rules_ppp0_eth0)!

 

[SHAH]

problem has been solved .. it was double NAT which was causing the issue. now everything is back to normal.