For several months now erg mode has not been working on my Cycleops Magnus. It used to sort of work in this past summer but then it got really bad and so I gave up and stopped doing workouts. Recently (last week) I calibrated my trainer (using the saris app) and tried an erg (group) workout. Once again, less than 5 minutes into the workout, erg mode screwed up again and I quit the workout and went on a free ride instead.
When I used erg mode the most recent time the resistance, as it was in the summer, felt very “non-linear” and the pedal stroke/wheel rotation felt weird, making it very difficult to maintain a steady cadence. Soon afterwards It got even worse and the resistance got cranked up really high with the "non-linear"ness getting even worse. At that point I quit the workout and gave up on erg mode once again.
I also get the same non-linear resistance effect on steep climbs when the resistance is set to more than 30-40% which is why I usually keep it set to around 25%.
Is there any way to fix this?