A device in slow internet conditions (≈ 30KBps) is failing to perform an auto-refresh which causes the following
# snap changes ID Status Spawn Ready Summary 68 Abort 20 days ago, at 06:06 EDT - Auto-refresh snaps "core18", <my snap>
# snap refresh <my snap> error: snap <my snap> has "auto-refresh" change in progress
I can only try a manual refresh after rebooting the device (or probably restarting snapd would allow this too, have not tried). This happens consistently on all devices that have similar internet speed.