is there anyway to fix it?
To fix a squeaky ratchety arm, this is what I've done with my Figuarts.
I use a teeny tiny dab of petroleum jelly or vaseline. If it is deep within, put it on a toothpick to carefully deliver the lubricant to the joint. Then carefully work the joint back and forth until it squeaks no more.
Why not try soaking the stiff part in hot water, then after loosening it, run it in cold water again.
Vaseline/petroleum jelly can have scentless type. I just use a generic brand. And it isn't sticky, it feels more greasy. So try to avoid getting it on any parts other than the ball joint; hence I recommend using a toothpick and steady hands.
If you do get a smudge a bit on a part you didn't mean to, tissue wipes it off easily enough.