@Joseph-TP 

If i RE705x lose connection with router it doesnt matter after reboot or i unplug eth cable and plug it back it lost connection to Internet, local networks works. When connection to internet is lost after i reboot RE705x if ethernet cable is plugged in it will never get internet connection. Only walkaround i found is that if i reboot RE705x i unplug eth cable, and when all starts up and internet is available, i plug back eth cable and everything work, till next reboot or unplug. If i reboot router it acts the same. When router is started no internet connection from RE705x. I tried to unplug eth cable without reboot and plug it back, on RE705x, it works as wifi repeater but when i plug back eth cable it stops immediately. 

 Hello @Joseph-TP 

Lower added my topology. It does not matter if there is switch between or not they act the same, i tried. 
Basically if ethernet connection is lost for any reason RE705x don't have access to internet after that.
I tried to disconnect RE705x which is behind switch and left only that is connected directly to router result was the same. If it is working in ethernet backhaul mode and it lost connection after reboot it self or router reboot or unplug ethernet cable, it never gets back internet. After reboot without ethernet cable it connects to router mesh and get internet access, after that i plug back ethernet cable and everything works like charm. Till next interruption.