Enlarge / The small bit of foam in the lower-right corner is apparently the only thing needed to make a Nintendo Switch left Joy-Con start working perfectly. (credit: Sean Hollister / CNet)
Update: Nintendo of America has issued the following statement to Ars Technica that seems to confirm much of what was shown in the original CNET report:

There is no design issue with the Joy-Con controllers, and no widespread proactive repair or replacement effort is underway.

A manufacturing variation has resulted in wireless interference with a small number of the left Joy-Con. Moving forward this will not be an issue, as the manufacturing variation has been addressed and corrected at the factory level.
We have determined a simple fix can be made to any affected Joy-Con to improve connectivity.
There are other reasons consumers may be experiencing wireless interference. We are asking consumers to contact our customer support team so we can help them determine if a repair is necessary.
If it is, consumers can send their controller directly to Nintendo for the adjustment, free of charge, with an anticipated quick return of less than a week. Repair timing may vary by region.

For help with any hardware or software questions, please visit http://support.nintendo.com.

Original Story
After initial reviews of the Nintendo Switch noted widespread issues with the left Joy-Con occasionally losing its wireless connection to the console, hackers have found that opening up the controller and adding a simple piece of wire seems to increase its effective range greatly. Now, Nintendo is offering a similar fix to users who call in to its support line, and the company may be selling redesigned, fixed controllers at stores right now.
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