When buying/downloading/updating a map or texture pack, it will refuse to update or let you download things because there "isn't enough storage on the device". The temporary fix is to delete any worlds or packs you aren't using (including your main worlds), find the content you want to download, delete it if it needs an update, and download it again. It does not matter how much space you have on the device or an SD Card, it will tell you that there isn't enough space for what you want. It will also refuse to load at all if my switch is put into sleep mode then turned on again, the marketplace is inaccessible.