all 5 seconds no traffic on WAN interface

Hello,

i want to setup a LB like this howto http://tiktube.com/video/DofH3iFnjDJomGEoIDFqnrquKlEoLqHq=
but all 5 seconds no traffic on WAN interface.

WAN 1 and WAN 2 the same on the LAN no drop.

No Firewall setup, only the config in der PDF.
only difference my LAN is a bridge.
Has anyone a idee?

Thanks and sorry for my bad english.
Unbenannt.jpg