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The solution is usually to call a repair electrician, who can use meters and other test equipment to find the leakage. Before hiring an electrician, one can try the following steps.
Take the charging adapter to a different house/outlet to see if same faults occur. This will isolate the issue to house wiring or charging adapter.
If charging adapter was exposed to moisture. Unplug the unit, air dry it naturally or with a hair dryer to see if problem persist.