Thank you. Gemini also suggest the removal of a tiny layer from the frame, but I really don't want to go there. I sent a message to Canyon, will see what they will offer.
in these 3-4 month almost all my rides where on steep tarmac roads, and yes, I do use the rear brake more than the front one, so no surprise that the rear one wears faster. Yes I will install a new pair and will get a couple of spare ones