My Home router keeps rebooting itself, roughly every 8 minutes , anyway to tell why or whats causing it to ?

My setup is 2 x VDSL Lines via 2860 Built in VDSL modem and WAN2 via Draytel 130 VDSL modem which is in Router mode as PPoE Pass-thru doesn't work

to set pure bridge a member got respond from the support
http://www.forum.draytek.co.uk/viewtopic.php?f=2&t=19453#p80413
It must be apply the same for the 130

For the reboots some solved by disable upnp or rolling back firmware with clean set up back from the begin
There is also a beta here and few infos in the link below
http://www.forum.draytek.co.uk/viewtopic.php?f=19&t=19313&start=80#p80330

Thanks

I updated the firmware and disabled the upnp so now doesn't reboot.

The PPPoE for the vigor130 on WAN2 for the Draytek Vigor2860 i sorted as well with the info from the above link mentioned only difference is the Vigor130 reboots constantly when applying and reboot of enabling bridge on
WAN > Internet access > WAN1 = MPOA/Static or dynamic - Select Disable and Tick "Enable Bridge Mode" , at this point I powered down the Vigor130 and plugged it back into WAN2 of Vigor2860 and setup PPPoE for WAN2 which rebooted to apply settings... once 2860 had rebooted switched on Vigor130 , I also now get the VDSL Connection details on status page of 2860 which is a bonus and WAN2 is as fast as WAN1 ( before WAN2 was 18Mb vs 37Mb of WAN1 )

I already applied new firmware that you mentioned , after making the Vigor ready for PPPoE Access mode only is when it reboots constantly but all i did is switch of and connect to WAN2 of Draytek Vigor2860 setup WAN2 for PPPoE and all is fine