I bought my H3 middle of June last year. The first time I noticed the noise was the 2nd month of ownership. The noise may have been there earlier and I didn't notice as I was enjoying the monsoon system.
The noise reminded me of a sound from brake pads which have been overheated and developed a glaze on the surface. I live in an area with heavy traffic and bad drivers. I had to get on the brakes hard a few times - don't know if this is the cause of the problem or not. I have seen mechnics sand the surface of the pads and rotors to eliminate a glazing problem. You may ask your dealer to check for glazing and try this fix if they don't have any other suggestions. Good luck and let me know what you find out.