Scratch/scratch brakes

Hi. Our Q2 now has about 20,000 km. on the bump, the brakes scrub like wild, especially if the car is not moved for a few days. I know the salt and strain the brakes here in winter, although I sometimes go fully into the brakes it doesn’t help?? Have it never experienced so ecstrem….?? Am I the only one that experience that problem??? Greeting Henrik