First Edition Prime Arcee arm ball joint problem

I recently got the First Edition Prime Arcee. It's a really great figure, I have a bit of a problem though, her left arm ball joint keeps popping out. It's almost like the joint is too small or the ball is too big. The arm will just fall down when I try to pose it.

It doesn't go all the way into the socket. Is there a way to correct this? My friend told me clear nail polish to tighten the joint... but will that would in a situation like this?

It doesn't go all the way into the socket. Is there a way to correct this? My friend told me clear nail polish to tighten the joint... but will that would in a situation like this?