Multiple sources with early Nintendo Switch consoles are reporting connectivity issues with the Joy-Cons.

All the sources reporting the issues are from the press, who received Nintendo Switch consoles early for preview purposes. The main complaint is that one of the Joy-Cons de-syncs while in the middle of the game.

https://twitter.com/jasonschreier/status/834767748685262850

I agree, with Jason Schreier of Kotaku. Nintendo is going to have a huge issue on their hands if this cannot be fixed with a firmware update. Every new console has a day one patch, right? Why should the Nintendo Switch be any different.

That’s why momma always says to wait a bit before picking up new hardware. To make sure all the bugs get worked out.