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Open the Settings app and go to Networks and Connections. Tap on WiFi and then Manage networks. Select the network you're experiencing an issue connecting to and tap on Forget. Restart your phone and then reconnect the network by going back to Networks and Connections and tapping on WiFi.
I updated to MIUI 12.5.1 on my Redmi Note 7 yesterday and after that my home Wi-Fi connection stopped working. I've tried multiple things like resetting the network settings, factory reset, also saw a post about WPA2 causing the issue but I can connect fine through a hotspot from my other phone that also has WPA2.
Wifixer fixes wifi disconecting problem on MIUI or custom rom. Maybe you have had noticed that sometimes your RN8P is disconected from your wifi and you have to switch off and turning on again wifi for fixing this (I wasted 2Gb of data by this bug ).
The solutions. In order to solve this problem, there are two ways that work for affected users . We can test these solutions individually or combine the two together to try to get everything back to normal. Reset network settings. The first is to reset the device's network settings.