Sluggish reverse shift
There was a TSB on 2013-14 with 6R80 with sluggish engagement to reverse.Look up TSB 13-4-15.
May have creeped its way back in later model years.
Had the repair done on my 13 and it still does it sometimes
2013 BBK Short tube, E-Force Stage 2, M/T 275/15/60 DR's, BMR LCA's with lowering brackets, Alum D/S, Strange FRT adjustable struts, strange adj rear, whiteline pan hard