Update
Upon much closer inspection, it doesn't even seem like a bend it is so minuscule. So i'm going to chalk it up to a 'manufacturing variation'. The symptom however, can be sort of reproduced by laying the tablet on a flat surface and pressing the corners to see if there is any movement, and i notice some movement when i press down on the upper right corner.
Cheers
I've replied to your PM message, but I'll post my reply here aswell from what you asked me to test on mine, just in case anyone else who is having problems wanted a way to compare what a normal one should do versus what a defective one should do.
So yours has a symmetrical(horizontally along the switch) curvature? Is it like in the picture you quoted or is that a lot more ?If you put the Switch on a flat surface with the screen facing up, and press the corners down, does it 'rock'?
Mine does, a little but only when i press the corners on the right side of the unit. A friend of mine has the same, except on the left side.
Cheers for trying it out!
No worries. Have just tried for you to see what happens. it does rock on mine a tiny bit aswell. (it's so subtle though that I even thought it didn't rock at all when I tried it the first couple of times) but when I tried it a few more times and looked more closely, I could see that it was actually rocking a tiny bit. So a little bit is probably fine. But if the way it rocks is really major though, then that's not a good sign, and likely more indicative of a defective unit worth getting replaced.
How much does the tablet pivot when it rocks on yours? (for me it's barely even a mm, perhaps less). So hopefully you find this a good way to gauge what's bad versus whats normal when comparing it to your experience.
I forgot to answer in your PM earlier about whether it was just on one side or not. For me it's on both sides, and is symmetrical, and almost unnoticeable. So from what you're describing that it's only happening on one side on yours, that difference alone is already ringing huge alarm bells in my mind that yours and your friends might actually have a genuine manufacturing fault.
If you're saying it rocks quite alot, I wouldn't just leave it. (I'd be onto Nintendo Customer Services like a shot whilst it's still under warranty). I hope it's just a case of a few bad batches being manufactured, and that this isn't an overheating problem that eventually happens to everybody's, because I think I would cry if that ever happened to me!
But I can confirm that both mine and my daughter's are kept in the dock most of the time, and has has been plugged in the whole time, both when using or just docking. So that to me is a more reassuring sign that the problem isn't more general. And getting yours replaced with a non defective unit should mean that it's not a recurring problem.
is it getting worse over time, or has the way it rocks been the same?
Testing this over time will help you to determine whether it's just a manufacturing flaw that will stay in the odd shape it was molded in, or whether it's something that's actually warping. Keeping my fingers crossed for you, dude!
But if it's any consolation, non faulty ones definitely do exist, and I'm coming across just as many people who have perfect ones both in person and all over the internet, so the good news is that even if yours does turn out to have problems, you'd be fully within your rights for warranty, and getting it replaced should solve your problem permanently.

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No warp for me, and I've played Zelda for 90 hours... 50-50 docked and undocked. I'm willing to bet they're warped in manufacturing.
(the Apple bluetooth keyboard I'm typing this on is so warped its wobbling as I type this )
lol. Yeah, warped keyboards I tend to suffer from all the time! (I find it happens a bit less when I just keep them flat instead of using the little retractable feet on them, but it still happens to me though quite quick, and that's usually down to warping, as it's something that usually starts off fine, but gets worse for me over time!)
So far so good on my Switch though. At least we know lots of us out there are not having any of the scary switch manufacturing issues I keep hearing about on forums. This is definitely reassuring!