Maybe it's the problem I am having: The router reboots endless.
It helped to unplug the cables und re-insert after 20 seconds.
Problem is based on CAPsMAN. If CAPs connect very early and create interfaces, the router reboots.
As the problem still exists, my current fix is to disable CAPsMAN and re-enabling it 30 seconds after boot.
/system scheduler
add name=startup on-event="/system script run startup" policy=\
ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon start-time=startup
/system script
add comment="Script to be run at system startup" dont-require-permissions=no name=startup owner=\
admin policy=ftp,reboot,read,write,policy,test,password,sniff,sensitive,romon source="# startu\
p script\
\n\
\n/caps-man/manager/set enabled=no\
\n/log info \"STARTUP: disabled CAPsMAN\"\
\n\
\n:delay 30000ms\
\n/log info \"STARTUP: enabled CAPsMAN\"\
\n/caps-man/manager/set enabled=yes"