The game is pested with a ready weapon bug.
Sometimes your character is stucked after you try to ready your weapon. You enter combat stance but you don't hold your weapon and can't do anything anymore. No attacking, no interaction with the world. Only thing you can do is to reload a save.
The same happens to your follower often, rendering them useless. Only thing you can do to get rid of it is to ask him to "trade with you" and remove the weapon, or the bow. Useing quick travel often helps too. Using quicksave/load doesn't helps.
This is more then pesty and a well know problem on PC amd Consoles .... will there be any chance to get a patch for that because it's a realy immersion show stopper if every third combat either your stucked or you need to render your follow to a useful state again.