Topic: Joycon problems :(

I received my switch as a gift in January this year and have had no problems with it until this week, the joy cons work perfectly fine when detached from the console and used as two controllers, and they appear to sync and connect fine to my switch in the Home Screen, however when playing a game in handheld mode I get a message that interrupts my game play saying “press L and R on controller”, I can either press B to to back or press L and R, if I press b the same message pops up again and again, if I press L and R, another message pops up saying “play with joy con controllers detached from the console” which I don’t want to do, has anyone else had an issue similar to this? I take really good care of my things and my switch has never been damaged.

@Beth21 Short answer is, I think that sounds normal. I don't think your Switch is broken/defective.

It's the quirk of the Switch that I and most everyone has seen since Switch launch in 2017. Needing to re-pair the controllers sometimes happens. Usually happens with third party games, I think - I could be wrong. I get the issue with Rocket League sometimes, and it's not the only game.

When you go to boot up some games, the game takes over, and it's like the console forgot you already paired the joycons/pro controller. But after you've re-paired the controller, you're good to go for the rest of the time playing that game session. I don't think the issue has ever raffected playing a game, since it only seems to occur before you start playing a game.

And yes, the message tells you to press a certain button, but it seems like it doesn't matter which button you press. I think I just hit B to back out, even though the prompt says L + R.

Edit: Sometimes, when playing handheld, the right joycon may un-pair, but it's only when starting the game, once it's re-paired, it plays fine until I'm done playing. (this issue was worse with launch consoles, and is less a problem with consoles sold after 2018-ish - they altered the internal antenna.)

Since it's under warranty you should contact Nintendo Support.