More than likely you are hitting the wear indicators. I suspect when you are going down hills and you are pressing on the brakes harder, you are getting into the wear indicators that are basically hard inserts in the pads that make noise as so that you know to replace the pads.
https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd
I am sure it is only a matter of time before you get the grinding all the time.
I would go ahead and remove the wheels and inspect the brakes and then change them if they are low as I suspect they are.
I am attaching the info below on how to replace the front pads. Please run through this and let us know what you find.
Thanks
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Tuesday, October 26th, 2021 AT 8:08 PM