i have a P3 professional with somewhere around 20 hours of flight time. Today flying in 80 degree F temperature and humidity of 60%. Not too unusual for this time of year. I got two warnings: Warning - Motor Idling (Propeller Loose or Missing), Warning - Motor Obstructed. I landed and everything checked okay. Motors were free and props tight. Finished that battery and during the second, same warnings. Third and fourth batteries, no warnings. This P3 is well cared for, travels in a case and has never had any warnings in operating temperatures of 10 degrees F to 100 degrees F. Although used on construction sites a lot, I hand catch and launch from clean concrete when possible. Isn't 20 hours early for motor failures? Thanks.