Bearing noise? Are you using green bearings? Sounds kind of like your clearance is ok when cold, but as stuff gets hot you don’t have enough, like a bearing with too tight of a tolerance.
That's my working theory also. Something is already a little close and then gets tighter as the pads or rotors or something else heats up. I have the Green bearings. New axels and narrowed housing built by Moser. Thanks.