I have two sites,
main: draytek 2930, Fw: 3.3.0, aDSL, 6000 down/600up
remote: draytek 2820, aDSL, 3000down/384up

In the remote site, there is a VoIP phone (alcatel PBX), which checks at every boot the version of the system against the PBX in the main site via tftp, using a Lan2Lan IPSec VPN tunnel. The phone uses a static IP.

Now, it happend two times in 4 weeks that for whatever reason the phone lost connection to the PBX and made an automatic restart, But, the restart did not finish, it ended up in an endless reboot of the phone.
Internet and VPN of the remote site to the main site is ok.

I rebooted the 2820, no change. I even see when the phone is starting, and I see some traffic flowing in the traffic monitor.
I rebooted the 2930, and, this fixes the problem.

Is there anyone who knows about similar problems, and has an Idea, what I could to besides a programmed reboot of the 2930 every 24hrs?

TIA