Last couple of days ran into this (old) bug quite a few times.. ie the same bug that used to happen with Reverberating Bash. I haven't noticed a specific skill causing it. Anybody else run into this bug more often now?! Wonder if something was changed in one the last patches.
The issue is, you get knocked down, CC break and it takes ages for your character to stand up, while you can already move around your body on the ground, but can't use any skills.. usually doesn't end well as you'll be dead before you can actually cast any skill again.