I have also been having this problem, but at times it happens at 70% battery and the only way to revive the phone is to plug into a charging decide and reset. When revived the phone states it has more or less the same battery as before it switched itself off. This seems to be a software issue that needs to be sorted ASAP. Sony, please can you advise on how this can be fixed? My phone has become unusable without a way to charge it on hand (and therefore not very mobile), and this is now happening at least once a day.
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