Hi, you’re in the wrong category here (which means the right people may not see your post): The snapcraft category holds discussions about the snapcraft software and the building side of snaps in general.
This is a problem with the runtime behaviour of a particular snap, not the software that packaged it. As mentioned above, it is always possible for a “Temporary failure in name resolution” to happen (networks are inherently unpredictable).
I don’t know what options there are for wpe-webkit-mir-kiosk to handle this scenario better, but here’s the package contact details:
$ snap info wpe-webkit-mir-kiosk | grep contact
contact: kontakt@glancr.de