I still have my OG SNES, and my son and I play Super Mario World together. One of the best games of all time. I've had trouble with a bunch of other cartridges though, Yoshi's Island, Donkey Kong Country, and Clayfighter all yield a blank screen at some point in the game. I have probably 20 functioning NES games, but almost none of my SNES games have lasted
In addition to what the other reply linked about cleaning the cartridges, it could be your SNES has some bad capacitors. Not all games use all parts of the motherboard, and from what I understand SNES consoles were somewhat plagued with bad caps like many electronics from the era. If you can solder it should be quite easy to just replace em all in one go; there are even kits you can buy that include all the correct ones.