Topic: Joy-Con problems...

My pair of Joy-Cons trouble me as well. Both sticks can't be calibrated properly.
In the menus and during gameplay it detects movement without my input.
I couldn't play the PixelJunk Monsters 2 demo because the camera moved automatically.

I need to send them in - and I have no second pair, so, a couple weeks Switch pause for me.

I think they're the worst controllers made by Nintendo, bar the NES one. Even the N64 analog sticks lived longer.

I sent my Joy-Con off for repair and got it back within 7 days. Seems to work ok now, fingers crossed it stays that way!

I feared I'd have to send mine in for repairs (again!) ..but I tried updating the controllers and resetting the calibration back to default (as well as giving the whole console a good clean) and it appears to have sorted things out ..might be worth trying if you're experiencing a similar issue (calibration/cursor drift)

Well guys, I'm bumping this, because I WAS about to buy a new replacement for my left joy con. It was getting worse, starting to affect Thumper and even Monster Hunter XX. But then I found this, I want to post it in case others are having drifting issues.

Long story short: It's the control stick cap.
EDIT: ....And it's back again....never mind. >_>

I have 4 Joy-Con in total - one is in for repairs for the issue above (covered under warranty) ..but I've since started having issues with two of the others! (one L, one R - warranty expired) - however, after watching the video @Joeynator3000 posted above, I appear to have fixed the issue with both Joy-Con without having to send them in! (**touch wood!**)

In the video above, the guy lifts the control stick cap clean off before re-attaching it - it looked like it'd be a bit of a pain to get the cap back on again, so I tried just prising the cap up a little on the side in which I was experiencing issues instead, then gently pressing it back in to position...and the sticks now appear to be working fine!

(For example, on the stick calibration screen, my right Joy-Con wasn't responding correctly when I pushed it to the right - so I tried gently prising the right side of the cap up and gently pressing it back in to position - and now it's working fine again! ..same result with the left Joy-Con! ..no need to pull the cap fully off, just doing it a little bit on the side that you're experiencing issues with could do the trick! )

Many thanks to @Joeynator3000 for sharing that video - might just have saved me a £60 repair bill! (..and I can finally play games like Fortnite without my character just randomly walking around like it has a mind of its own! Haha!)

Great stuff!

EDIT: Oh - just noticed that you've since edited your post to say that the issue has returned ..might just be a temporary 'fix' then, I guess - dang!

EDIT2: My right Joy-Con is still working after the above 'fix' - but the problem with the left one has returned (..and I've tried repeating the above to no avail )

@Joeynator3000 Have you try the table tennis to play with the Joy-Con controller?

I stopped messing with it and bought a replacement joycon.

Annoyingly, my left Joy-Con stick appears to have developed a drift and a jitter that can't be solved through calibration. My Switch is less than two-months old, so it's still under warranty, but sending it in will mean no Switch gaming for however long it takes them to fix it... unless I want to spend the $80 for a new pair as backup.

Doing an internet search, I found a forum post that suggested re-pairing the Joy-Cons, and that seems to have resolved the issue for me, at least for now (and hopefully for good!). The jitter I was seeing before even as I was calibrating is completely gone. Hopefully it's not a temporary fluke. I would really hate to have to go through the hassle of a warranty repair.

I always seem to have the same issues with my right Joy-Con. Nothing has fixed it, even doing an update every so often. Ideas?

If you can't resolve the issue on your own then your only other options are to either buy a new Joy-Con or contact Nintendo for a repair. If you're still under warranty then the repair is free; otherwise, there's a cost, though I don't know what it is.

Honestly, I don't know if it is or not. I got the Switch as a gift. I doubt it's repairable. Some people I have spoken to have said it is because Bluetooth devices can interfere with each other when close together.