exFAT is known to fuck up your Switch stuff because of Nintendo's dogshit drivers, so it's most probably that. Never happened to me personally, but it is common if you interrupt a write from what I've read online.i think is a exfat one
There are no individual game files larger than 4GB on Switch, afaik. Yes, games can be much bigger than 4GB but the constituent files which will reside on your SD aren't. FAT32 works just fine because of this. I have a 1.5TB FAT32 card full of my own games and I've never had an issue with installs.wasn't fat 32 limited to 4 gb of stuff , some games are larger than that also is the switch itself that formatted the sd in it's correct mode the first time i inserted the sd , it was a brand new sd