Two days ago, Huawei posted an announcement that some users have reported that some new mobile phones cannot be charged past 80% charge.
Huawei support said that the R&D department will be organized as soon as possible to analyze the causes of this problem and the problem will be fixed as soon as possible.
But for now, users are advised to go to "Settings -> Apps and Services -> Application Management -> Phone Manager -> (four dots in the top right corner) Uninstall updates" and then reboot the device to return to normal.
Such a problem has been identified not only in the Mate 40 series, but also in other Huawei phone models. Users facing this issue can follow the official guide and uninstall the latest update first.