HiGame

Ever since the Nintendo Switch launched, there have been issues reported with its left Joy-Con controller. Teardowns and analysis confirmed the source of the problem. Unlike the right Joy-Con, which had its own separate antenna, the left Joy-Con’s antenna was part of the circuit board and partly shielded by the player’s hand.
Nintendo has fixed the problem with the left Joy-Con by implementing a small piece of conductive foam at the corner of the Joy-Con, as shown in the image below:




That small bit of conducting foam is apparently resolving the problems with connectivity for just about everyone, as reported by Cnet.

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