#sensor-issue

i've been hitting the treadmill at 5k/m for two weeks, but every time i hit the 0% setting, my wahoo drops heart rate readings to 0 and then spikes to 170. i double checked the calibration, it's fine, the treadmill's motor torque output is nominal, no loose cables. tbh i don't get why the sensor would act up only on flat, especially with my wattage staying stable. any insight on sensor misreading due to treadmill motor hum or battery sag? want a quick fix before I buy new equipment