Fitness Tracker Not Working? 4 Fixes (2026)

Toggle Bluetooth off and on, then force-close and reopen the companion app. If that fails, unpair the tracker in your phone's Bluetooth settings and re-pair through the app, not through system Bluetooth. As a last resort, restart the tracker itself, usually via a long-press of its button or through its settings menu.

Fit is the usual culprit: wear the band one notch tighter during workouts and one notch looser otherwise, positioned a finger's width above the wrist bone. Tattoos, very hairy wrists, and cold skin all degrade optical sensors; warming up for five minutes often fixes erratic early-workout readings. Clean the sensor with a damp cloth, since sweat film blocks the light.

Always-on display is the biggest drain; switching to raise-to-wake can double battery life. Frequent GPS sessions, continuous SpO2, and high notification volume all cost power. If a previously good battery suddenly collapses, check for a stuck firmware update in the app.

Make sure activity and sleep permissions are granted in both the phone OS and the companion app; OS updates sometimes revoke them silently. For sleep, the tracker must be worn snugly all night, and some models need a minimum wear time before generating sleep scores. A factory reset through the app resolves persistent tracking gaps.