I just got my dv888 about a week ago, and i love it, but after the first few days it started making a squicing noise, whenever i would unscrew, and screw the caps back on. If you have any advise (or know how to get rid of it) i would appreciate it. 
Lube? Mine does it now and then, but not continuously. I think it’s okay…
It’s fine. It’ll be annoying, but hopefully you won’t have to unscrew it much. It won’t hurt anything though.
Your dv888 is perfectly fine. I had a question on this and asked Ben, he said it is just a sign of a good fit. Mine does it too, so do most YYF’s.
Yep. Good threading is all it is. My TT does it.