It would be helpful if there were more details about your Rhino, like does it have a lift kit? What is shape of your control arm bushings, is there a lot of movement? How many times have you removed and reinstalled this axle? Have you tried replacing the circlip ring on the end of the axle (or whatever it is called)? Check manual but believe it is recommended to replace this spring ring every time and when it gets worn it will not hold the axle in very well.
08 700 Black Armor SE, resi-shocks, 27" ITP Mudlite XTR, STI single Beadlock 14x7 wheels, JBS 734, Carillo crank & Rod, Viking Cam & inj,MSD, 4pt harn, Viper 4500 winch, Unleashed sheave, JBS 18 gr OD weights & purple spring(greased), Innovate AFR Gauge,Rigid Dually,2 batts with man switch, 6"chopped cage, Mishi rad