i9505 strange battery problems
I own my stock Galaxy S4 i9505 for 2 months now, and since a week or 2 it started to act strange.
The phone turned always around 20% battery off, and started to freeze sometimes in normal use.
I did today a factory reset, since then it turns off around 63% battery.
Ill try to charge it for 100% and let it charge for some more hours, and do another factory reset then, but i doubt its a battery calibration problem.
Do you guys have any tip that could help me, or should i just return it to seller?
Thanks in advance!