TWO ISSUES FOR ORBI RBK852

Hi,FURRYe38 . Thanks for your help. As you mention in other posts. First,I change my switch from cisco sg95d(with green saving feature) to netgear old gs switch（without green saving fature).  Orbi in the ap mode:

My configuration 1 is as follows:

Ubnt ER4-Switch-RBR850(lan)

Ubnt ER4-Switch-RBS850(lan)

In this configuration,everything is fine except in the RBR850 Login page(shows no internet connection every few minutes, but indeed it has. )I try to ping some website constanly, when the magenta light show, it says in the page that no internet connection, while the ping is normal, no packet loss and lag. If I choose the configuration 2 as follows:

Ubnt ER4-Switch-RBR850(WAN)

Ubnt ER4-Switch-RBS850(lan)

the magenta light disappear,but in the RBR850 devce lists, you can't see RBS850.(for the rbk50, this configuration works,but it tooks few minutes for the rbr50 to find rbs50 in the device list. And if you do via lan port(rbk 50 connect the internet via lan port, the rbk50 find rbs50 in seconds)

I also have the rbk50 set. It works perfectly in configuration 1.  And I tried to connect the RBS 850 directly wired to RBR 850(AP MODE), as long as the RBR850 connects to the Internet via Lan port, the magenta light shows(not constantly, some times every few minutes, some times every few hours) It won't happen in the rbk50(same configuration)  So I think there is a bug in the firmware.

As far as I know, in the ap mode, wan and lan port are the same(in some meaning), while for RBR850, if it connects to the internet via lan port instead of wan port, the magenta light shows(log in page, shows no internet connection, it is back to normal in seconds) I mean the magenta light show and disappear within one minute.

Another no password for the 5g wifi issues, it appears in some resets.(I guess there is a bug in the firmware) The solution is probably that when you set up your RBK850, you have to do it in slow way(no rush in every step,wait one minute even it says ok in the page.(espically if you do ethernet backhaul or ap mode)

Thank again.