You can try the following methods to solve the problem:

1, first clean up the garbage of the mobile phone in Tencent's mobile phone housekeeper, and then click the mobile phone in the upper right corner to slim down the mobile phone files for in-depth cleaning;

2. Detect the problem of the wifi device, namely the router, to see whether the network connection of the router is abnormal;

3. Turn off the mobile phone, restart it later, refresh the mobile phone network, and reconnect the wireless network.