I am the 2nd owner of my Simpson Rover. When I first got the brush it lost probably 20+ hairs on the first 2 uses. Since then its calmed down to 1-4 hairs per use. I have noticed that the hairs it is losing are pretty long and what appears to me aren't breaking but coming loose from the knot. I doubt WCS will help me since I am the 2nd owner but hopefully Simpson can help me if it is a serious issue. I have tried the washing and combing lightly a few times and I don't use a lot of pressure on my brushes. I really hate this as it is the softest and nicest knot of Simpson Best I have ever felt.