This could be sofware bug and it is advised wait until nxt update which it will receive and also chk battery management in device care which highlights the battery drainer apps.
same here with A50 also first I have to charge one time a day but now 2 times and also slow charging is detected first it need only 1.5 to 2 hours for complete charge but now 4 and sometimes 5 to 6 hours are required to full charge.
