I have a Play BOX NET FTTH router. I can't change it because it's a device provided by my internet provider. I tried boosting its signal using a TP-Link RE700X. Creating an extended network in the app worked fine. Unfortunately, after a while (minutes, hours), the router disconnects from the external (global) internet, and the main 5G network is then disconnected from it. This has happened, for example, when connecting a TV decoder to an internet booster via Ethernet cable. This phenomenon doesn't occur without an internet booster. I've tested using the same and different SSIDs for the main and extended networks. No change. Has anyone ever encountered something like this? What can I change?