@BBC1972 In general if you purchased a static IP address from your ISP then would suffice just to use your ISP provide username/password to get that staqtic IP on your WAN interface. There's an...

@Alain_Agde There's no timeout setting for the web-management page session so you can't be logged in indefinatelly. After a particular time period of inactivity your web session will log off...

@Behappy07 If you don't have any WPA3 compatible client device then stick to the WPA2 PSK (AES) only. That won't reduce your wireless security since your devices don't support WPA3.

@tarekitsme Archer AX55 does not support WDS feature, only C80 supports that and you can use it to connected to another wireless router or modem. If you have to choose between AX55 and C80 to connect...

@nodram As explained in the thread you posted - these hidden networks are meant for building a mesh network. Do you have any other wireless router except Decos in your LAN, that could emit such...

@Behappy07 Make sure that these client devices support WPA3 security - this could be the reason.