There was quite a wide spread issue with syncing the JoyCons on launch, particular with the left one - http://m.uk.ign.com/articles/2017/03/22/nintendo-confirms

There was quite a wide spread issue with syncing the JoyCons on launch, particular with the left one - http://m.uk.ign.com/articles/2017/03/22/nintendo-confirms-switch-joy-con-sync-issues-caused-by-manufacturing-error http://m.uk.ign.com/articles/2017/03/22/nintendo-confirms-sw... I haven’t had any issues personally though, I think it’s a great console!