You can try polishing the hook, but it is probably the yarn. Maybe rubbing the hook with some wax paper will help.

Tami

The hook may need a good de-greasing if it's one that you use a lot. Try really hot water and a grease-cutting soap like Dawn. If that doesn't help, then I'd suspect the yarn.

Annie

What is the hook made of before we advise hot water. If it is plastic or metal, try the hot water. If it is wood, don't.

I wonder if the yarn got dirty or soiled in storage. I was given some REALLY old synthetic yarn stored in a box in a garage for decades. It made my hands dirty. I think part of the problem had been that it was made so many years ago that it was not the good quality synthetic we get today. It was an early effort at manufacturing synthetic yarn.

My metal ones sometimes stick too I rub some cornstrch on them and it helps

I disagree with damascusannie, grease makes yarn or thread slide better, not worse.
I read somewhere that with sticky knitting needles, a person could make the yarn flow more smoothly over them by running them through your hair.
If it works for knitting, maybe it will work for crocheting?

Try my way first and then hers.

Old Italian remedy. ....rub the hook part through your hair!! Try it it works!!

Omg...iOmg...it worked great ...thank you..