We’ve received some alerts about intermittently-failing snap downloads, we are looking into the situation and will update once we know more.
The failure is manifested as “503” errors when trying to download (install/refresh) snaps. Retrying is safe and might result in a working download after a few attempts.
Current status and updates can be seen at: https://status.snapcraft.io/
Apologies for the inconvenience,
Snap Store team
[UPDATE] 17/12/2019 16:38 UTC - Failures have subsided and downloads are back to normal. We will keep monitoring for any recurrences.