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Annoying double chime when manually changing lanes

Out fo the blue, my 2017 Model S 100 D has begun to give a double chime when changing lanes, or encroaching on a lane marker.

I triple checked, and the Lane Departure warning, which vibrates the steering wheel (no audible chimes) is OFF.

I have:

Checked the User Manual, and found no references to audible lane warnings.

Checked every MCU setting I can think of, and

rebooted the MCU,

rebooted the center display.

These chimes are really annoying!

Any suggestions on how to get rid of them would be welcome.