A couple of days ago we reported that the small Joy-Con controllers for the Nintendo Switch might have connection and syncing issues. Nintendo is now looking into those reports.
The problems seems to be only with the left Joy-con controller, which has a tendency to lose connectivity with the console when docked.
In fact, the connection issues were deemed so bad that one member of the press had to switch to a Pro controller instead.
Hopefully it’s something that can be fixed with a firmware update before the console launches.
PR for Nintendo tells me that the company is aware of reports some reviewers had w/ Joy-Con de-synch and are investigating. Nothing more yet
— Stephen Totilo (@stephentotilo) February 24, 2017