I had a similar situation / sound with my 2014 Mazda 3. They had to replace the transmission. It was covered as it was under warranty. Make sure you dealer is checking tech reports from Mazda.
Ugh I ended up looking closely after waxing and noticed it's a bit dirty in those little holes. I can't think of a way other than a rag and pencil going in each an every hole.
I have a question regarding my 2017 CX-5 Touring auto on headlights. It is me or it just seems like the headlights are on all the time? Are the running leds that bright?