If you left an in tender switch controller or joy con with the council while you are using it we have a simple fix.
Before we get started, Nintendo knows some are experiencing connectivity problems we definitely recommend simply sending your controller to an Nintendo who will fix the problem for free including shipping both ways not to mention they get the job done with a pretty quick turn around.
But if you want to take matters into your own hands, and you don't mind potentially voiding your switch warranty here's the fix.
You'll need a pair of tweezers, a small Phillips head screwdriver and a small tri-wing screwdriver, which isn't Phillips so you may have to get it in a special kit.
You'll also need a small bit of conductive polyurethane foam.
Also, a quick thanks to Shawn Hollister for loaning us his hands.
Android [UNKNOWN] to demonstrate this fix.
Open up your left joycon by removing the triwing screws on the back of the controller.
Once you're in move the battery out of your way but don't detach it.
Then remove only these three Philips screws holding the battery and pop it out so you can access the circuit board.
Take your tweezers and drop the conductive foam onto the lower right side of the board.
From there, it's as simply as putting the plate back, making sure not to snag the ribbon cables when you do.
Refeeding the battery and closing up your joy-con.
This is how Nintendo appears to be fixing the Joy-Cons in their own facilities, and it seems to solve the issues without too much fuss.
Now you can get back to exploring Hyrule in Legend of Zelda: Breath of the Wild without any dropped connections.