The Pro is not very smart i seems thenI think the default is erg is on for workouts only unless you disable it- which I usually do. You see the option on screen but that option is not available for a normal ride.
For normal non workout rides and this includes the socials erg isn't an issue. On a smart trainer resistance will change with gradient and power with rider input as it did on yesterday's ride.
. Think I will dig out my older Pro (with the metal glued stepper-motor axel) and see if things works better.

not sure what to suggest regards the work out.

.


.