My new 2025 GWM Cannon has a loud grinding noise and brake warning lights, but GWM cannot find any fault with the brakes

I purchased a 2025 GWM Cannon Lux 4x4 in July this year and have been having an intermittent issue with a loud grinding noise which occurs at random when driving around town and has also occurred sometimes when reversing. This issue occurs on average one or two times a week. The issue has not occurred during highway driving. We have noticed that when this issue occurs, the brake light (brake symbol) on the dash flashes on intermittently, and we have also noticed that there is a slight vehicle jolt that we sometimes feel.

We have had the vehicle back to the dealer three times now for this issue but they cannot find any fault with the braking system. The dealer has also replaced the timing belt for a cyclic noise recall, the turbo has also been checked out and found okay. We have booked the vehicle in for another investigation at another GWM service centre in a fortnight. Any idea or comments you might have would be appreciated.