You've obviously never owned a KTM, the RC8 used to seize up, was told I was doing it wrong, wash then clean, rinse with demineralised water, then blow dry.
Weirdly, not one of my Ducati, Aprilia or BMW all of which have brembo calipers/discs ever suffered from that problem, I just washed then hosed down.
Although my K has started showing rust on the discs, Tokico calipers not sure of the disc manufacturer.
If it's under warranty complain.
Sent from my SM-G925F using Tapatalk