Strange "bonging" noise

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2014 Mazda CX-5 GT AWD w/Tech
Got new tires on Monday. Soon after got a buzzing noise alert and TPMS light came on. Pushed the reset button and all was/is good. Drove from MN to NY on Tuesday/Wednesday. Toward the end of the trip heard a strange "bonging" noise about three times. Consists of 3 short "bongs" in a row. It is not a "beep" and it is not a "buzz". Heard it about 5 times today on a short drive (10 miles). No lights on dash. No messages in message center. It is not a "bong" like the seat belt bong, it is a lower more urgent pitch. No one else in car but me. 40,000 miles on vehicle and never heard the noise before. I checked connections under seats to be sure nothing disconnected. Any thoughts? I am stumped!
 
You bet. All over the place here in Southern Ontario, Canada. Next time you hear it, watch the upper part of the screen.
 
I did see a strange symbol in the upper left part of the screen which I hadn't seen before. But I was driving and couldn't really stare at it (plus I need reading glasses to see smaller items on that screen). But that is wild if that is what it is!
 
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