[SOLVED] Sticky headband of HDJ2000

Hello!

I did some research around the forum and I saw many people that seem to have experienced the same issue I am having. My HDJ2000 are really new (less than 6 months old), I bought them from a trustful shop and I store it properly after every use. Now it has this sticky thing like the headband like it is melting or something. The other posts with this issue were closed with no final answer. Is Pioneer aware about this? Should I return them? It would be a big problem to me since I would have to send it to another city. Oh, and one detail! I just use those at home since for performing I use an older one from another brand (I wont mention which not to break any forum rule).

Help!