Grinding noise coming from front end?

I purchased the vehicle listed above a certified pre-owned. It drove fine for the first 6 months, but after I dropped it off at a detailer to get it cleaned, it started making a “grinding/squeaking” sound from the front end. The sound happens either when steering or braking.

It only happened once in a while at first. I brought the car to 2 different Cadillac dealers to have it inspected by a mechanic, but both said they weren’t able to get the car to demonstrate the grinding sound while they test drove it. They both inspected the vehicle while on the lift and said everything looked fine.

The sound has been happening a lot more frequently. The other day, I just happened to press the “Mode” button near the shifter, which changes the driving mode between Tour, Sport, and Snow/Ice. I set the driving mode to Tour after I purchased the vehicle, but when I pressed it the other day, it was in Sport mode. I changed it back to Tour mode, and the grinding/squeaking seemed to stop.

I’m assuming that when I dropped my vehicle off to get detailed, they pressed the “Mode” button while cleaning the car, causing the driving mode to switch to “Sport” mode.

I’m trying to figure out what reason would cause this while the vehicle is in Sport mode?