sounds like you have moisture in them,either water or grease from the seals..time to check them and reseal them..you can take the little red plug out and rotate the wheel to see what you have in there...reseal them then you will need to adjust them..
2003 rincon(red of course)6564 miles,
big horn radials,yamaha grizz wheels,works shocks,montana jacks multi-mount,ramsey 2500 wireless winch,warn bumper,jtatv temp guage,ricochet full skid plates and a-arm guards,tamarack ft box,cajun gas tank and cajun dri-box on custon tilt rack,dyno-jet with k@n filter,h/l disc brakes,fender flares,moose hand guards,heated hand grips,coolant fan by-pass switch,
see pics here.
go here for OE rincon parts at discount prices..