Ummm, I know the show isn't via the satellite. I run AT40: The 80s on KRKE (I am its remote program director and consult the other stations in that ownership cluster). Premiere does include droppable "extras" but even if you run those, Sunday night is usually problematic for us ... the morning run always plays without a hitch.
"Simply ending early" means the legal IDs are falling in funny places as well, and when Casey says "welcome to the fourth hour" at ten minutes before the hour, it sounds ... well, dumb. The dead air would be preferable.