Tire Traker pressure monitor - possible interference issues?

Sorry for the incomplete info.........the monitor isn't updating while moving down the road. I tried putting the sensors on the truck wheels to see if distance was causing the problem but the monitor still doesn't update while moving. In the morning I would carry the monitor around and unscrew the sensors, reset the pressures and the monitor would update. Head down the road and the pressures would always stay at the last known number.