However it seems that despite Nintendo’s claims of no issues on the left Joy-Con, they could have an updated version of it in the works, as evidenced by recent photos that show the controller being submitted to the FCC. It is unclear as to what changes Nintendo might have made, but it has been speculated that this new submission could be an updated version of the left controller that addresses the connectivity issue.
It is possible that it might have been redesigned internally, such as a better/new antenna design, which is why Nintendo needs to resubmit it to the FCC for approval since it is a different component from the previous version. That being said it is unclear which batches of the Switch could benefit from this updated design, although to Nintendo’s credit there haven’t really been many complaints about faulty Joy-Cons since then.