Protip: They aren't loose.
When I opened mine and went to grab him from the plastic tray my
thumb landed in a big glob of mold release gel. These newer toys seems
to slathered in the stuff. I have guesses as to why but they are only
guesses. But when I found this mess on the toy and then saw his floppy
legs it made me wonder...
So what I just did was open his hips and thighs and rub the joints
down with denatured alcohol. I let the parts dry, put them back together
and the joints are back to normal. The things aren't loose, just greasy!
If you want to do this let me first say that rubbing alcohol isn't
enough. Denatured is a lot stronger. The stuff is flammable. It also
evaporates really quickly so it's not a danger unless you toss the stuff
directly on an open flame like a lunatic. You can buy it in where most
paint thinners are sold.
If not that then you can wash the parts THOROUGHLY with
dish washing liquid. This cuts the grease but it takes longer to scrub
the parts and then to let them dry. But it does work so there's that.
Just don't put the parts in the dish washer.