Hello, I have found since DLC launch that if you are holding whirlwind and you pop any shouts at all, the Divine Barrage stops. This happens about 90% of the time even though I am at full health. Tested in Training room as well to make sure I am not taking any damage for it to fall off. Makes part of this Mythic Useless with WW.
This has always been buggy along with having to mash the buttons over and over to the point of exhaustion to actually max out the WW+Bolts DPS.