There have been several reports of running avatars stopping and starting during a run, as well as having trouble finishing run calibration. This appears as a dropout on Zwift, where the speed goes to 0 then jumps back up quickly to actual speed.
Please make sure that you’ve checked for any bluetooth interference issues, and that your battery on your device is full.
If you are experiencing this issue, please open a support inquiry stating the problem, what devices and platform you are using, a .fit file of the run activity, and any details that may help us reproduce the problem in our labs.
This post will be updated as new information is received. Thank you for your patience!