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That's normal if you are using the phone at the same time as you are charging, while playing heavy games or watching movies
I had this issue when the phone was new. After some cycles the battery stabilized and the problem went away.
Try to charge when your phone is off, if the problem is still, reason must be hardware, if not, just repair your phone via PCC.
Yeah I say don't organise a repair. Because it can too risky. Best to buy a new one.