I was wondering the same thing about recir/outside air mode. Mine always stays in recirc mode when on auto. The manual says it's automatically selected.
I got a similar message three times today on the way home. It also said something about adverse conditions. It went away on it's own after a minute or two.
Was suprized to receive in the mail yesterday a very nice "welcome to the Mazda family" kit. It was addressing my new CX-5 purchase and also came with coupons for discounted accessory purchases. I just wanted to mention it because I though it was a classy touch. My previous car was a brand new...
I bought my 2017 cx-5 3 weeks before the 2018's came out. I had some sense the 17's were released late in the year, so I asked the salesman what would be different about the 18's and what about aa? He said only this difference would be a diesel version and Android Auto would be available 1st...