If you, like me and several other Kotaku staff, have run into a consistent left Switch JoyCon signal issue, don't worry: Nintendo says it isn't in fact a hardware problem, but a "manufacturing variation". The company also says to contact them for a fix if you're running into the problem.
Here's Nintendo of America's full statement to Kotaku:
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.
A CNET report suggests that Nintendo's fix is to stick a tiny piece of conductive foam in the left JoyCon, so feel free to try that yourself if you're feeling adventurous. Otherwise, hit up Nintendo, and make sure you know it's clear that this isn't a design issue but a manufacturing variation.