My rog 5s phone automatically shuts off when it's under 15 %. Does my phone battery have a problem?

[Gene_Lloyd]

Please tell us some basic information before asking for help:
Model Name:Rog 5s
Firmware Version:
Rooted or not:not
Frequency of Occurrence: it has happened 3 times now and it's been only a week since I've bought it.
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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[Gustav_ASUS]

@Gene Lloyd Hopefully your issue can be solved by calibrating your battery. Follow the instructions given by @k_huat above and let me know how it goes.