I feel the rain-sensing wipers on CX-5 is not that precise like our BMW 528i but like the level of our VW Passat. Strangely Mazda decided to make AUTO mode ALWAYS functional if you keep the stalk there. Whereas most other cars will disable the "Auto" function once you turned off the engine and you always have to turn off the wipers and turn them back on to Auto mode in order to make it functional. I believe the latter is a better way to protect the wiper system.
When you were doing the testing, did you pour water at rain sensor area of your windshield in front of rear view mirror?I tried turning things off and on........there is something not right about the automatic wipers. Something needs to be changed.
It rained the other day.......several times so I had a good chance (several chances) at testing the wipers. Big rain drops...coming down at a good clip.
The dealership recently upgraded my software because the car was stalling as I backed it out of garage. It could be that the upgrade affected the automatic wipers. Last time he said that I had the sensitivity on the wipers was set too low. I will take it in next week.