[Apple iPod] Disappearing tracks?

What does it mean when tracks disappear? I now have a few exclamation
marks on the right side of my iTunes. The tracks are still on my iPod,
but obviously I get the "can't sync" message. The dont' even exist my
hard drive any more?

I realize that if it isn't on the drive, iTunes can't find it.... has
anyone heard of iTunes removing tracks?

Grabbing at straws... trying to figure out why stuff is going away.

All thoughts appreciated....

thanks....

---Paul in Southern NJ

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