@Joseph-TP 

When I wrote my first post I had already connected a PC to the modem and I can reach tinternet when the router is down. I have changed all the cables and the fault is still there. I have connected a ASUS router and that one is still working when thev BE230 internet goes down. 

I'm at the same time having a case with my ISP and they said that the most probably case I the router.

If I check the BE230 and ISP modem then the network goes down.

Before BE firmware upgrade:

ISP modem WAN=GREEN LAN=NO LIGHT

BE = REBOOTING

after upgrade

ISP WAN=GREEN LAN = GREEN

BE= RED

In both cases the ASUS router is working.

Maybe I should connect my second BE router and see if the LAN goes down at the same time.

I bought the BE routers to be able to use the smb sharing and that is turned off right now and I want that to work as well.

Now I have 3 separate networks connected to the same ISP modem.

BE with smb enabled SW 20260330

BE without smb enabled SW 20260330

Asus

Now we will see what happens, just have to wait until the next time Internet goes down.

Sometimes it goes fast and sometimes it takes a couple of days before I get the no internet connection.

It will be quite easy to see where the problem is located.