Spotify decided to log out while on the flight :(
Genuinely curious, I don't use it but would have expected offline things to continue as they were while cut off from the rest of the network.
To be fair to Spotify it never happened to me before. Maybe it’s their DRM that just locks you out if it can’t reach the server with a timeout of 1 hour or so (1 hour conditional on the last attempt being a failure).