If those having this issue could post the name-server of the affected characters, it would help narrow down what might be wrong.
I’ve played this character (my main) non stop in feral and guardian spec. I haven’t had any issues at all.
It could be some weird combo of talents that’s bugged. It could be a piece of gear you all share that’s bugged. It could be an add-on.
If you guys want something to be investigated as a bug you’ve got to post the affected characters for devs to take a look at to even begin to see what they can find.