Game Mechanics: Sneak dropping randomly?

[Namegen_Isterrible]

A few times in the last couple days in unrest, I've been hiding+sneaking my way around and suddenly I get the "you have moved and are no longer hidden" message out of the blue.

I guess I could potentially be hitting my sneak hotkey on accident, but it seems pretty unlikely to me.

Anyone else having this happen to them? Once earlier today a groupmate rogue also swore that he was hide+sneak as he was working his way into the basement of unrest when he suddenly was aggrod by a skeleton that doesn't see through hide.