Some Switch users have experienced issues with Joy-Con connectivity, with the left controller being more prominent. The issues have prompted some owners to send units in to Nintendo for a fix.
CNET Australia sent in its left Joy-Con, and received it back about a week later. Before / after shots show that Nintendo apparently just added a black square of foam in the lower-right corner.
The top photo is what the controller was like before. Here’s a look after it was repaired:
CNET speculates that “it’s likely a piece of conductive foam, which is foam that’s been specially treated with nickel, copper or both so it can shield electronics from RF interference.” Also, “this piece of foam is sitting directly on top of the Joy-Con’s antenna traces, too, which suggests that it’s protecting the antenna from interference.” CNET took things further and removed the foam, which brought back connectivity issues. So ultimately, that small addition is improving things.
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