Most of the miles are motorway. Very rarely brake hard! Thought it might have been an issue with getting the cheaper end disc so got Brembo for the last set, maybe lasted a little longer but the issues back. Changed the discs myself, as I have dozens of times on lots of cars for myself and friends. Always make sure the mating surfaces are perfectly clean and flat. Never had this issue before and it's always the same wheel. I'm at a loss!