Hardware reasons, the aging life of the battery, or the battery contact rust or oxidation, resulting in poor contact is difficult to charge. You can go to the repair of the phone to test and clean the contacts.
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Software reasons, have you installed any new software, programs ah? It is possible that some program is of low quality and causes a system conflict that consumes a lot of additional system resources to deal with it, correct it, and therefore consumes more energy (power) than usual.