My Sansung Note 8 makes a reandom chirping noise - what is it, and how do I stop it?

Throughout the day, my Note 8 chirps, and it's driving me nuts. There are 2 different chirps: One of them is a quick chirping sound of an A5-G5-A5 , the other C6-G5-A5. They happen in Do Not Disturb mode, they happen with all app notifications turned off, and there's nothing in the Notifications panel. They seem to happen only when I'm moving, either in the house, walking down the street, or even driving, so I think they might be announcing a change in the Wifi environment, but that's only a guess.

This is a new Note 8, a replacement for a damaged Note 8. The original one didn't chirp, but as far as I can tell the software and apps are configured identically.

Phone data:
Model SM-N950U
Hardware version REV1.0
Android 8.0.0
Samsung Experience version 9.0
...and a bunch of other versions I'd be happy to provide if anyone thinks it'll do any good.

I've had this phone now for a few months, and it's been updated several times; the chirps persist across all updates so far.

Help!

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