Nexus 9 charging issue

As the charger is connected, I play alot, then sometimes it charges itself no more, even if it get cold now.

I can't figure it out. I just checked in the App Ampere.

It is connected. But it doesn't charge anymore. Until I pull the connect out and reconnect.

I've never had a device like that.

is there someone play game hard with this device?

then please try this way and let me know

Thanks alot!!

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