I don't remember having this trouble weeks ago when playing another Dragonknight at same level.
On low levels, I like to use a bow until I get to where I can trait scatter shot. Then I keep scatter shot on my skill bar and switch to my preferred weapon. I had no trouble before starting with a bow shoot, then using stonefist and dark talons when the mob(s) get close. But now I seem to freeze after my bow shot. It looks she is still shooting, even though no damage shows on the mob's health bar. Also, sometimes I get a lag between being able to use skills, even though I have enough magicka. And these are instant cast skills too. This is not a good thing, as she has almost died to mobs that should have been quick to defeat.