Nintendo released a statement to Kotaku today addressing the Switch’s left JoyCon connectivity issue, saying that the widespread issue is a “manufacturing variation”. The statement insists that there is nothing wrong with the JoyCon hardware that would be cause for replacement, and that the variation has already been corrected at a factory level. You can read the full article here.
Nintendo is also offering anybody affected by the issue the chance to send their JoyCon in to them for an adjustment free of charge, which is a good move. The JoyCon sync issue has been widespread since the launch of the Switch, even affecting Game Informer’s own Andrew Reiner. He wrote a piece about some of the other tribulations of his time with the Switch, which you can read about here.