Suspected cause for my case: Vivo android phone use "randomized MAC address" when connected to WiFi My house have main router + mesh router I do IP Binding with Mac address Combination above caused the issue. Solution: On android, in respective connected WiFi setting, change Privacy to "Use device MAC" Go to router > LAN > DCHP and remove any previous binding with your phone name Off Wifi on phone, go to another router, on wifi on phone, connect to it Fixed Regards Matthew
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