The not eating or sleeping is is a result of the same bug that causes footmen not to attack and is now fixed. Being immortal and frozen may or may not be related. It’ll be hard to tell until the next patch comes out.
@Phagocytosis correctly diagnosed this one which is now fixed.
Thanks to all the great bug reports, the game is becoming stable quickly. (Well, as long as you’re not trying to deliberately break it…)