The humidity is high enough in bathroom while running a hot shower for condensation to build up on your phone. Condensation is no longer vapor, it's liquid water and it can damage your phone. Sufficient condensation build up tripping the sensor is not a mistake; it's by design.I still think that if you possibly have your phone in the bathroom while taking a shower, it's going to be humid and it will set off a sensor, regardless of the "engineering" of the water sensor.