Other North & South America Frequent Flyer Programs - Why did Spirit Airlines reduce Lima Flights to Saturday Only?

Does anyone know Why did Spirit Airlines reduce Lima Flights to Saturday Only from daily service?Were they doing badly on this route?
Or is this just a computer glitch that doesnt let you book for any other day?

Wild guess--because they weren't making any money flying more often :)
Checking an independent booking engine does confirm that they are only operating on Saturdays at least in October. Didn't bother checking the full schedule. The plane also seems to remain overnight in Lima and fly back during the day, which is a change as well, I believe.