I think there is a bug in the Goneril fight. I would evade and my "Brush with Death" would kick in. I would slide really far away. I couldn't counter-attack at all because of the distance. These battles are always super tedious and boring because they require so much passive dodging and evading, which really isn't much of a test of skill. But to lose my best opportunities to counter was extremely frustrating. I won the fight simply by being at a much higher level than I needed to be.
I think there is also a bug in general with the more elite bosses. Sometimes when I am trying to aim my bow, I start dashing. Maybe this is a skill kicking in that I don't understand, but it is very annoying. It doesn't seem to happen with normal enemies.