so i am having it too, tracker 1 marker 6-10 stop registering movement, cannot calibrate or reset, uninstalled then reinstall: no result, went to settings and clicked reset settings: no result, went into app folder and erased everything: corruption reinstall: no result.
i have tried any and all recommendations to date and the marker 1 calibrations are intact and cannot be erased or reset. need developer help at this point.