I just got a new ST-Key today for my Japanese Saturn games. After plugging it in for the first time, the boot screen for the cart would not appear.
After opening up the console and dusting it out, I put the cart back in. Nothing happened that time either, so I then tried wiggling it around in the slot to make sure it was tight.
After that, it booted up without an issue.

Everytime I remove the cart, I have to wiggle it around a bit upon putting it back in if I want it to work. Is my Saturn's cartridge slot going bad, or is this accessory just weird to work with?
Also, leaving it in the Saturn wouldn't be a problem, would it?

Thanks!