Leadership problem.
In fact, I'd venture a guess that abandons & returns being a problem regardless of volume is almost typically a leadership problem.
The one thing I know of to be true in life and especially life at Target is this... when a problem pops up. Jump on it. Fix it ASAP. Otherwise shit snowballs and then it becomes unbearable to the point that it has a negative impact on morale. We are emotional creatures, after all.
Our store got rid of the black bins that we used to sort different departments into at the service desk and I thought it was going to be awful... boy was I wrong... it forced leadership to not let shit snowball and guess what? Our strays have never been easier to maintain and I've been with Target for 10 years.
I will say this though... if there is ever a time of year where it becomes unbearable and practically not doable with staffing REGARDLESS of volume it is back to school. If anyone says "back to school" at my store, I cringe hard. So much worse than Christmas.