I use Mr. Crappie joker-tail jigs and they work very well but, after catching about 2-3 fish, the jig starts to fall off every time you drop it down. Is there any way to harden them so that they stay on? Any help is greatly appreciated. Thank You!!

Super glue just a pinhead dab then slide on your jigbody.
Let setup couple seconds, good to go

Thank You Sir!!

That is very savvy advice
I have 2 bottles in my boat, Locktite regular and the gel. Once I figure out what they want, I glue to jig to the jig hook. Baits last 3-4 times minimum longer glued than without. While night fishing, I have used the same Slab Bug all night without replacing it and came home with a livewell stuffed with fish
Just saying
I will say I was originally worried about the smell and/or taste, but it hasn't affect the bite whatsoever.....

I also use super glue for line cuts, pluging holes after removing hooks from hands and anything else I need to repair on the water.