I’ve been using the Zwift ‘FTP Builder’ training program which uses ERG and while peddling the watts drop from 180 to 0 and in another instance from 130 to 0. When this happens the resistance completely dissapears and then after about 5 - 10 seconds of continued peddling the resistance comes back on and the watts reappear, although this element (2 minutes@180) of the training program isn’t saved as completed and the star the signifies the task has been completed does not appear.
My kicker is 2 months old and it’s linked via Bluetooth to my 13inch Macbook Air.