The total of games in the lower right corner in the pic remembers me of the limit.
Any chance to solve this closing-app-crash problem meanwhile ?
As I already explained, this is not a limit that Nintendo set out of the malice in their hearts. It isn't even a set limit per se and isn't set anywhere inside the app, so there's nothing anyone can do about it. The app simply crashes when trying to save the information of so many games.
Have you noticed how the more games you add the more time the app takes to close? That's because the app saves at close time where every single one of those games is in your custom sort, the last time you played each one of them, how long you played each one of them, what you did in some of them, at what time down to the second did you open, saved progress, saved a state and closed each one of them. All of that is saved in a .json inside the app's save file (extract it with checkpoint and take a look yourself if you want). After you have added so many games, the app can't handle it anymore, says an audible (if you are close enough and in a quiet room) "fuck it" and crashes all the way to hell. There's nothing that can be done about it. Nintendo will release a maximum of 70 or so games for this total, so they will never ever run into this "problem".
Incidentally, the amount of games the crash will happen with is not set in stone. It's usually around 280, but if you add games and later remove them, or if you change their "code", the app will still count removed games and old codes as active games so theoretically you can have an app that crashes on exit while having only 2 games added because the app is still trying to save info for all the games you removed or change the code of.
If this happens to you or anyone reading this, one drastic solution is to delete your save file but you'll lose progress in all your games. Another less crazy solution is to extract the save file with checkpoint, edit or delete the .json file, reinsert it with checkpoint and open the app, which will make the app think the .json file is corrupt and create a new one. The "only" think you'll lose is your custom sort which kinda hurts for a while if you're like me and get crazy meticulous with it, but at least you'll be able to keep your game progress. Keep in mind that this is only for people who have less than the limit of games (around 280) but still get the app because they have added some games and deleted them at some point.