I purchased a router and updated it to the latest version 7.14.2. I configured WiFi (the Hide SSID checkbox was checked), Android worked without problems in two bands (2.4Ghz and 5Ghz). IPhone problems, connection interruptions in screen lock mode (when lying on the table without action). The problem turned out to be in the DHCP Server, by default it is set to every 10 minutes, I set it to 18 hours and the problem disappeared. DHCP Server -> DHCP -> defconf -> Lease Time -> 18:00:00. I still don’t understand why a home user needs to rent every 10 minutes by default...