Here is what happened to me yesterday:
I completed a workout with Erg mode turned on - all good so far
After the workout I rode for another 20 minutes or so, the Kickr correctly adjusted the resistance based on the hills I was on - all good so far
I stopped my workout and switched bikes (took my bike off of the Kickr and swapped it with a new one). The new one didn’t have any way of providing my cadence
When I continued to ride, I noticed the Kickr wasn’t providing any resistance based on the hills. It’s like I was riding a regular “dumb” trainer.
I’ve read lots of reports about people losing Erg mode after pausing a ride, I guess my problem was the opposite, losing “smart” mode after pausing. Or was my problem because I changed to a bike that didn’t provide cadence? Is that necessary for a “smart” trainer ride?