Yeah this is a somewhat know issue with Super Smash Bros. for Nintendo 3DS. When enabled, it prevents many people from connecting online ("A communication error has occurred").
But I never found out exactly what the problem was with the "Data from Friends" option. Is it possible that one of my...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi