Fitbit Sense heats up when charging and not turning on.

Hi,
I have a Fitbit sense, and it was kept on charging overnight.

When checked in the morning the watch was not turning on, even after holding the power button nothing happens. No logo, no vibration.

When connecting the charger, the watch heats up and is hot in abnormal way.

Suspecting some problem with power circuit / chip.

Any suggestions is welcome.

Thanks.