I have now installed the beta 1.1.6 firmware (BE800) and since then the 5G network has not failed anymore

@Kevin_Z : I have the problem that sometimes the entire 5G network fails on the BE800, and only works again after a restart of the router. Will this beta firmware solve that problem?

I have an AX90 router, but, why does TP-Link not adjust the Deco's software that you also use them as a range extender with ethernet backhaul for OneMesh?

@Solla-topee I have a TP-Link AX90 router and hope TP-Link will develop a Range Extender AX6600 with Ethernet backhaul support. Or that you can use a Deco X90 as a Range Extender with Ethernet...