As with a lot of devices, they can run hot when used for extended period of times. Take your mobile phone, for example, play a power hungry game on it and you’ll feel the heat building up. The Nintendo Switch is no different, it uses power and has to expel heat, something it might not be doing quick enough.
While the console is docked, it runs faster and hotter than it does while it is in handheld mode. That extra heat appears to be too much for the fans the deal with, which could be causing the whole console to warp. Extended play outside of the dock may also cause the same defect to occur but likely to take longer as it runs cooler in handheld mode.
On Reddit /u/_NSR compares their Switch to the lines on an iPad cover for comparison showing a distinctive curve the what should be a straight console. NeoGAF user jokkir put a metal ruler on theirs showing a noticeable gap under the ruler edge.
While the bend doesn’t seem to affect the usability of the console, it isn’t good to find out that your new Nintendo console isn’t how it should be. Also, it isn’t clear how much the console could bend before damaging components inside.
The Nintendo Switch launched in early March but stock for the console has been low as is usual with Nintendo.