Doesn't charging fast

Even though iam charging with 18w fast charger,still it's not charging fast.i have facing this issue since last one day.
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Even though iam charging with 18w fast charger,still it's not charging fast.i have facing this issue since last one day.
Comments
Are you using the original charger? Have you tried with an alternate cable?
Are you trying to charge while using the phone in an intensive task (gaming)? The phone will also refuse to fast charge when not being used and at room temperature?