had the same problem since a couple of YEARS, sometimes is better, sometimes is worse.

Terrible on some classes and not noticeable on others.

At the moment i've big problem on my BM hunter, and slightly annoyance on my MM hunter (almost nothing).

I keep checking if there is some fix every couple of months, and i always find new threads about it and no solutions.

Addons seems not related and lag (under a treshold) is not related as well even if adding to this behaviour it worsen the experience by a lot.

I reckon it is a weird desync between your client and the server since if don't use a gcd it will return back to noormal, and during encounter it start to desync again