It's the software that is at fault. Fire Emblem Warriors is known to have occasional errors, so you don't have to worry about your console. FEW also autosaves after every battle, so you cannot lose much of your progress.
Skyrim is a Bethesda game, so it's a given that the software is the culprit.
EDIT: The one thing that you can do is enable the system menu/internet option to automatically submit errors to Nintendo and developers. While that isn't an immediate fix or anything, it provides a chance that errors can be minimized or eliminated with upcoming patches. Of course that's pointless for games that the developers have no interest in working on anymore, but for something like FEW which has ongoing post-launch support in various ways, it is a realistic chance to help improve matters for yourself and other players.Last edited by RolStoppable - on 04 February 2018