WiFi disconnected, dropped line, etc. is the problem of the mobile phone, not the signal problem, the default is a high frequency receiver in the mobile phone, and we generally use the router is 2.4g frequency to receive signals, so it will lead to poor reception signal.
Another reason is the router problem, the home router generally supports IPv4 protocol, but now the new version supports IPv6, but also supports IPv4 but unstable, so there will be WiFi interruption problems.
Mi 11WiFi is always disconnected, because the appearance module of Mi 11 is broken, you only need to replace the WiFi module to restore Mi 11 frames, and after the network function is restored, you can continue to play games and watch videos with Mi C.