I have the warranty of the old owner, no problems, I talked to the Sennheiser Romania representative, there is no problem, I will take a walk and leave my ie800 there this week.
I think that my cables hardening might be because I sweat... BAD. I live in a college dorm at the moment, no cooling, and outside are 35-40 C degrees. I literally have to stay in wet clothes, even buying a fan does not help, the air itself is hot. As a side note, this could be the reason my cables hardened. Maybe people living in a cold country will never have hard cables.
I know that they changed the cables, so they do not hard anymore.