These systems are garbage. There is no ability to create a dedicated 2.4ghz channel aside from activating the guest network which then tells you there is a "security risk" because you guest network is

Recently has a failed read between X20 and Sonoff devices. Suddenly appear ofline and then reconect in random times LOG: Fri Sep 30 18:49:12 2022 daemon.err udhcpd[11159]: Sending ACK to 192.168.68.50