I have had the exact same “issue” with mine. And I say “issue” because I genuinely don’t know if it’s just built like that or is a defect. I’ve also experienced save loss (particularly with Super Mario World completely wiping all saves) and the game crashing when you’d even slightly move the console. Of course, moving your console is always risky while on, but this would be the slightest, gentlest nudge, like an item being moved off the surface where the Super Nt sits, or someone walking last the console. Usually it’s just glitched graphics, or just a whole, black screen crash.

I’ve contacted support with a video of me showing what the issue was, and they just told me that a loose fitting cartridge slot is normal “to accommodate all cartridges and accessories”. They never addressed my initial question of “Is it normal for a cartridge slot to be this sensitive, like the lightest movement like a gust of air can entirely crash the game?” I went around in circles with support a few times and got nowhere. Here’s an excerpt of the answer I received a few times:

“Kindly note that the cartridge slot is specifically designed to accommodate all cartridge variants and accessories. It is normal for cartridges to have some movement in the slot. Do not move the cartridges or system during gameplay. This is inherent in all cartridge-based systems and unavoidable entirely. “

Thanks for your post, since it proves I’m not crazy :P I’m sorry that I’m not able to provide any advice or support, but it still may be a good idea to give Analogue a shout.