If you own a Fitbit to track your daily workouts, it would be wise to check for an update being released by the fitness firm. It appears some of these popular wearables have been hit by a worrying bug that could cause their batteries to overheat. Fitbit, which Google now owns , has called the glitch “a potential risk for users” so it's definitely not an alert you want to ignore. Currently, it seems only Fitbit Sense and Fitbit Versa 3 devices are affected but it's still worth making sure your