I have been set up on Zwift with Wattbike Atom, iMac (2012), ZC app on iPhone and Garmin Dual HRM for a while with no problems. Used an Ant+ dongle.
Just got an iPad Pro and all connect via BTE on the connection screen. However, when doing a workout using ERG mode, there is very high resistance to start (often barely able to turn pedals) and once going, the control of power levels is all over the place. Frequent power spikes, drops and cadence very variable.
I have removed anything else BTE and even tried without the fan nearby but no change.
Any ideas what to try next?