This has only started happening since the latest Hotfix 6 patch to the point that I have now turned controller vibration off entirely.
I can’t tell you what is causing this to happen but it mostly seems to happen because I’ve been in a fight and the controller continues to pulse after the combat encounter is over.
However, it has started to pulse and then won’t stop even if I haven’t been in combat.
Apologies I can’t be clearer than that.