@ImtiazAli Wi-Fi security is set to WPA2 only, always has been, I don't have option for WPA2-PSK? Only WPA2 or WPA/WPA2. I'm not sure which Android version the TV runs, but I noticed it has update...

@David-TP This update made one of my Android TV start to lose connection all the time. The TV brand/model is Xiaomi QLED A Pro, I haven't noticed such issue with one of my Samsung TVs but they do not...