Nintendo has come up with a relatively simple and inexpensive fix for the Joy-Con desync issue that has been plaguing Switch owners. Yes, that is a piece of specially treated foam.
First, the bad news: It's a hardware issue, so there's no point waiting around for a software update, or following Nintendo's suggestions to maybe never use your Switch near aquariums or microwaves or any wireless device ever made. (I wish I were joking.) But here's the good news: Nintendo fixed my faulty Joy-Con in under a week. And the process was just about the best electronics customer service I've ever experienced.