anyone else have a gear 2 with a horribly inaccurate HRM when exercising? sometimes it will randomly show 50 bpm at high intensity and then 170 bpm while cooling down. Not sure if I have a defective unit or the HRM on these things is just a novelty and not actually useful like a standard HRM you wear on your chest. Also, anyone know if they plan on a mode for exercises that dont involve moving around like resistance training/aerobics?