I use my Whoo Kickr with Trainer Road and Bkool and I never have any issues. However, when I use it with Zwift the experience is far from satisfactory. I did a 45min session this evening and selected ECO mode. I was expecting steady pace, but no such luck. I had to drop the gears in some sections just to keep moving, on some flat sections, I was out of the saddle just about keeping the pedals turning.
This has happened quite a few times now, my other apps are fine.
Will a re-install help ?