Xiaomi mobile phone is not easy to judge.

Abnormal network connection or insufficient memory in the mobile phone.

In this case, you can check whether the mobile phone network is normal first, and it is recommended to connect to the wireless network. If there is no problem with the network, check whether the memory of the mobile phone is insufficient. If the memory of the mobile phone is insufficient, it is recommended to clear the memory and download it yourself. If none of the above works, check whether the APP authorizes the trust of the mobile phone system, and it is not recommended to authorize trust.