While channeling Whirlwind and full of resource channeling stops. This occurs with or without enemies on screen. This occurs turning or traveling straight on the screen. It worsens as speed of attack increases. If you pop a speed pylon, hit Wrath of the Breserker, hit a channeling pylon, etc etc it worsens.
Extra information. The solution you implimented to stop the 10 second freeze due to the Windows 10 2004/5 update seems to have broken this. No more 10 second freezes but now channeling breaks. This has been tested on mobile, wifi, and hardwire networks. No other programs or games on computer impacted by this issue (same as the 10 sec freeze).
Thank You and have a good day.