I have the same problem, and i've been having it since April. Started after an update. Sometimes the phone won't even charge. The battery will go down during charging. One thing that helps me prolong the charge is to restart the phone. I notice, however, that sometimes the bluetooth is on when it restarts. I don't use bluetooth. So i have to turn it off. I might be blind but i haven't seen any reply from Sony about this. If so, that is really poor, I have two acquaintances with the same phone and the same problem. Different ages on the phone.
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