Hi,
I suddlenly experienced the issue of very low resistance when zwifting. Everything worked just fine during this winter until two weeks ago when I was doing a workout in ERG mode.
This was the exakt scenario. I finished the workout and decided that I wanted to continue freeriding for a while in the same world without exiting the activity, just continue riding directly after the workout. When I started to pedal after the workout the restistance was suddenly very low and I could easily spin out on the highest gear. I saved the activity and restarted zwift to see if the issue would disappear. Pairing with Ant+, no issue. Picked Watopia and Volcano route to freeride. Problem still there.
Closed down everything, did a hard reset to the trainer, unpaired all of the connections, connected to Wahoo app for a factory spindown (have the Kickr V4 so it needs calibration) with success. Started an activity in the Wahoo app. Everything felt completely normal. Unpaired the kickr from the phone etc. Started zwift - everything paired as normal. Felt normal when pedaling BUT at the exakt moment when I did choose a route to freeride (Watopia - Volcano) and pressed “Start Ride” the resistance in the trainer dropped massivley.
Got madly irritated. Tried MyWhoosh - no problems with the restistance. Tried other platforms - No problems. Disassembled the trainer, cleaned everything, checked everything. No issues. Tried connecting through phone, tablet, desktop computer. Still the same issue in zwift…
Tried doing workouts in Zwift - worked like a charm. No problems. Started a freeride - resistance problems all over again. WTF!!!
Something is obviously off with the communication between the Kickr and Zwift and take note, only Zwift. So what to do. Just for the sake of troubleshooting I assigned my Assiomas as cadence sensor and voila. Everything worked just fine again. So it seems like the cadence function from the Wahoo can disturb the resistance feedback protocol in zwift.