This is now a known issue that Blizzard plans (hopes?) to fix in a future patch, and will try to address with a hotfix this season, if they can.
I have been trying to recreate the teleport problem people have been reporting with Flurry, but haven’t been able to reproduce it.
But in the process I have noticed that Flurry will just explode randomly, as if I had stopped channeling it, even though my finger never leaves the button.
You can reproduce this in town by channeling Flurry for awhile, and moving around in circles or back and forth.
I have tried several combinations of skills, and moved TR from Right to Left MB, and then to the keyboard. And it hasn’t made any change in how often this occurs.
In fact I couldn’t detect any clear pattern.
I am beginning to think it might be network related, like a dropped packet. During all these tests the in game ping indicator was always green.